There’s also a problem with January, the month the president takes office. In other words, data for that month reflects what happened under the previous president, not the new president. You need to add together two sets of numbers, every month, and then subtract two sets of numbers. With January 2009 as the start date, you get: -339,000 under Obama and a gain of 3.52 million under Trump. That yields 2.3 million for Obama vs. 3 million for Trump, using February as our starting month.

Source: Washington Post February 06, 2020 16:39 UTC