Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Year | Title | Role | Notes |
| --- | --- | --- | --- |
| 1989–1993 | Short Attention Span Theater | Host | Co-Presented four seasons |
| 1993–1995 | The Jon Stewart Show | Host | Creator, Executive producer, Writer |
| 1996 | The Larry Sanders Show | Himself | 6 episodes from 1996-1998 |
| 1997 | The Nanny | Bobby | Episode: "Kissing Cousins" |
| 1997 | NewsRadio | Andrew | Episode: "Twins" |
| 1997 | Dr Katz, Professional Therapist | Jon | Voice, Episode "Guess Who" |
| 1997 | Space Ghost Coast to Coast | Himself | Episode: "Mayonnaise" |
| 1997 | Mr. Show | Himself | Episode: "A White Man Set Them Free" |
| 1998 | Elmopalooza | Himself | TV Special |
| 1999 | Spin City | Parker | Episode: "Wall Street" |
| 1999–present | The Daily Show | Host | Executive producer, Writer |
| 2001 | 43rd Annual Grammy Awards | Host | TV Special |
| 2002 | 44th Annual Grammy Awards | Host | TV Special |
| 2002 | Saturday Night Live | Host | Episode: "Jon Stewart/India.Arie" |
| 2006 | 78th Academy Awards | Host | TV Special |
| 2006 | American Dad | Himself | Voice, Episode: "Irregarding Steve" |
| 2007 | Jack's Big Music Show | Brunk Stinegrouber | Episode: "Groundhog Day" |
| 2008 | The Simpsons | Himself | Voice, Episode: "E Pluribus Wiggum" |
| 2008 | 80th Academy Awards | Host | TV Special |
| 2012 | Robot Chicken | Matt Trakker, Serpentor | Voice, Episode: "Executed by the State" |
| 2013 | Big Time Rush | Himself | Episode: "Big Time Invasion" |
Question:
how many more roles did jon stewart have in 1997 compared to 2007?
Answer:
4