what is the total amount of american players that have won the western open since 2007?
3
Year Player Country Score To par Margin\nof victory Course Location Purse ($) Winner's\nshare ($)
2014 Cherry Hills Country Club Cherry Hills Village, Colorado 8,000,000 1,440,000
2013 Zach Johnson United States 64-70-69-65=268 –16 2 strokes Conway Farms Golf Club Lake Forest, Illinois 8,000,000 1,440,000
2012 Rory McIlroy Northern Ireland 64-68-69-67=268 –20 2 strokes Crooked Stick Golf Club Carmel, Indiana 8,000,000 1,440,000
2011 Justin Rose England 63-68-69-71=271 –13 2 strokes Cog Hill Golf & Country Club Lemont, Illinois 8,000,000 1,440,000
2010 Dustin Johnson United States 68-70-68-69=275 –9 1 stroke Cog Hill Golf & Country Club Lemont, Illinois 7,500,000 1,350,000
2009 Tiger Woods (2) United States 68-67-62-68=265 –19 8 strokes Cog Hill Golf & Country Club Lemont, Illinois 7,500,000 1,350,000
2008 Camilo Villegas Colombia 65-66-66-68=265 –15 2 strokes Bellerive Country Club Town and Country, Missouri 7,000,000 1,260,000
2007 Tiger Woods United States 67-67-65-63=262 –22 2 strokes Cog Hill Golf & Country Club Lemont, Illinois 7,000,000 1,260,000
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