CNN — Jay Leno will host The Tonight Show" for the final time Thursday.
According to the Center for Media and Public Affairs at George Mason University, President Bill Clinton was the butt of 10% of Leno's jokes.
Next was President George W. Bush, Al Gore and President Barack Obama.
OJ Simpson was Leno's top celebrity target.
Leno has hosted The Tonight Show for 22 years. He is being replaced by Jimmy Fallon.