Here are the results (for anyone who might be interested):
PCC Natural Markets -- 35%
Whole Foods -- 23.5%
Fred Meyer -- 11.8%
Safeway/Pavilions/Vons -- 5.9%
Grocery Outlet -- 5.9%
Other -- 17%
Stores listed under other included Trader Joe's, Sunflower Market, Central Co-Op and Kroger (which is the same family of stores as Fred Meyer).