As was pointed out to you, while the election was in November of 2008, Obama did not take office until January 20, 2009. Since Obama did not serve the entire year of 2009, that isn't one of the years that counted.
The important point is that Obama had seven straight years of GDP growth, after his first year trying to recover from the housing crisis. While the growth of the GDP fluctuated those years, it was a slow but steady growth. The growth so far this year is little different than the growth during the Obama years. While things could change, there has been no real change in GDP growth under Trump, and little in terms of signs that it is going to happen. This also appears to be true with pretty much any economic growth indicator you look at, the growth rates are similar to those under Obama.
Having said that, one of the most laughable is how Trump is talking about how great employment is, since it is roughly the same as it was under Obama. The only difference is that Trump is no longer talking about the uncounted unemployed -- those that had unemployment benefits run out and/or quit looking for work -- like he did all through the election. He, instead, talks about how low the unemployment numbers and how great he's done (even though he hasn't really done anything, other than stop the federal government from hiring). So, he claimed we had a real unemployment rate of 20% before the election but brags about his great economy and the low federal employment rates now, despite the fact that there has been no huge surge in employment.