|Event|Winner|Second|Third|Fourth|
|---|---|---|---|---|
|2008 Telstra Men's Pro|Josh Constable|Seb Wilson|Grant Thomas|Jackson Close|
|2008 Banana Boat Women's Pro|Jennifer Smith|Janna Irons|Justin Dupont|Selby Riddle|
|2007 Odyssey 20/20 Men's Pro|Josh Constable|Harrison Roach|Jackson Close|Harley Ingleby|
|2007 Banana Boat Women's Pro|Chelsea Wlliams|Lisa Nicholson|Isabelle Braley|Crystal Dzigas|
|2009 Golden Breed Mens Pro LQS|Taylor Jensen|Josh Constable|Christian Wach|Harrison Roach|
|2009 Banana Boat Women's Pro|Chelsea Wlliams|Melissa Combo|IsaSelby Riddle|Isabelle Brayley|
|2010 Golden Breed Mens Pro LQS|Taylor Jensen|Josh Constable|Christian Wach|Jackson Close|
|2010 The Back Beach Women’s 1 Star Pro|Crystal Dzigas|Isabele Braly|Leah Dawson|Rosie Locke|

Question: what is the total number of times chelsea williams was the winner between 2007 and 2010?
Answer: 2