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Those eight years saw the nation grapple with the worst economic disaster since the Great Depression. The country's response to that crisis helped reshape the economy and the makeup of the political system a few times over. And for every day of those eight years, the nation was at war -- on multiple fronts, against multiple groups for multiple purposes.

All of these momentous changes during Obama's presidency had very real effects on people across the country and the globe. And for each of these real-world impacts, there is a number.

The recession cost many people their livelihood. The following years saw many of those same people gain it back. While part of the drop in unemployment came from people leaving the workforce, enough people have jobs now that, statistically speaking, employment has recovered from the darkest days of the economic crisis.

Due in part to a revolution in domestic fossil fuels and massive oil production overseas, oil and gas have been pretty cheap for some of Obama's presidency.

Here's what the situation looks like.

Following years of upward climb and a rally after President-elect Donald Trump's electoral victory, stocks are near record highs.

Here's stock market performance as of January 3, 2017:

Obama's election coincided with Democratic victories across the nation and the strong 2008 showing built on the party's successes in 2006. But as the years went on, the situation virtually reversed itself. Obama will exit office with the Republican Party resurgent on the state and federal levels.

Deaths from opioid-related overdose deaths have been on the rise. More people are dying from overdoses on heroin and prescription pain medicine like oxycodone and fentanyl.

States with legal marijuana or cannabis products have blossomed under Obama. When he took office, recreational marijuana wasn't legal in any state.

The Affordable Care Act set aside funding for states to expand Medicaid -- a government health care program for the poorest Americans. But the process became something of a tussle with state governments and many of their Republican leaders. By the end of Obama's presidency, only the slim majority of states had opted to expand Medicaid.

As the economy recovered and the Affordable Care Act, also known as Obamacare, reformed the health care market, more people had health insurance coverage.

Here's the total percentage of people without insurance, according to the US Census Bureau's American Community Survey:

By the end of Obama's presidency, government debt had nearly doubled to about $20 trillion.

Trump said during his campaign that he'd create a special force to deport undocumented immigrants. Although Obama criticized Trump's immigration proposals, he detained and deported millions of men, women and children. Obama's administration deported the people -- 434,015 -- in 2013.

The US has grown more unequal over the past few decades, including the past eight years.

One commonly cited measure is the Gini index. The number ranges from zero to 1, and the higher the Gini index is, the more unequal the distribution of income is.

According to the Census, it was .469 in 2009 and .4817 in 2017.

The bottom half of earners have seen their pre-tax incomes fall while the highest earners have seen a fairly steady rise.

Debate abounds over how and why incomes vary by gender and whether the wage gap can fairly be said to exist. However, men and women, as well as people of different races, all have much different pay.

Following the dips in growth that marked the recession, the economy slowly and steadily rebounded. Many, including Trump, have said observed rates of growth are far too low.

Hate crime incidents in the US neared 6,000 in both 2013 and 2015.

The Obama administration created 11.3 million jobs in eight years, and the economy added jobs for 75 straight months, a record that totals 6 years.

More jobs were created under Obama than under George W. Bush, who only created 2.1 million jobs. However, Obama fell short of Bill Clinton and Ronald Reagan, who saw 22.9 million and 15.9 million jobs created, respectively, under their presidencies.

The countries he hosted include:

When he was elected in 2008, 28,223,000 people were receiving food stamps.

In 2016, 44,219,000 people received food stamps -- an increase of nearly 16 million people.

Although Obama has vastly reduced the number of troops in Afghanistan during his time in office, he has failed to withdraw all American troops from the battlefields of Iraq and Afghanistan.

As of December 2016, there were still 9,800 troops left.

As of January 2017, 45 prisoners remain and 171 have been released under Obama.

Nine of the 171 have been "confirmed" to have returned to terrorist activities, according to a government report.

Obama had pledged to close the controversial center within one year in an executive order he signed shortly after his inauguration in January 2009.

Obama hit the links 333 times since assuming the presidency, according to CBS News' Mark Knoller, the unofficial White House statistician who pledged to track each and every round played by the commander in chief.

While his critics have said this is too many rounds to play, his figure doesn't come close to the amount played by Woodrow Wilson, who is said to have played 1,200 rounds while President.

In 2015, the median was $56,516, which was a 5.2% increase from 2014. This was also the first increase in median income since 2007, before the economic crash.

In December 2016, the index was a high 113.7 -- a stark difference to when fell as low as 25 during the recession, when Obama took office.

The poverty rate in the United States in 2015 was 13.5%. This is down 1.2 percentage points from 14.8% in 2014. In 2015, there were 43.1 million people in poverty, 3.5 million fewer than in 2014.

The birth rate fell to 59.8 births per 1,000 women in 2016 under Obama.

The price of milk decreased under Obama from $3.58/gallon when he took office in January 2009 to $3.28/gallon as of November 2016.

CNN's Kevin Liptak, a White House reporter, has kept a running tally of Obama's acts of clemency -- the president's decisions to pardon or commute criminal sentences.

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44 ways to judge the Obama era - CNN International