Here are the numbers: The Dow closed at about 7,949 points on Obama's Inauguration Day and at 19,732 eight years later on his last day in office. This is an impressive 148-percent increase over Obama's eight years or 18.5 percent per year. The S&P 500 closed at about 805 on Obama's Inauguration Day and at 2,264 on Obama's last day in office. Again, an impressive 181-percent increase or a 22.6 percent average increase per year (1.88 percent per month). On Trump's Inauguration Day, Jan. 20, 2017, the S&P closed at 2,271. Eight months later on Aug. 20, it closed at 2,473, an 8.89 percent increase (1.48 percent per month). Again, Trump has maintained about the same, or slightly lower, stock market growth that he inherited from Obama.