CREATE TABLE table_2960 ("Vehicle" TEXT, "Operating mode" TEXT, "EPA rated All-electric range" TEXT, "EPA rated combined fuel economy" TEXT, "Clean electric grid California  ( San Francisco ) " TEXT, "U.S. national average electric mix" TEXT, "Dirty electric grid Rocky Mountains  ( Denver ) " TEXT)

How many clean electric grid california (san francisco) figures are given for the Nissan Leaf?
SELECT COUNT("Clean electric grid California (San Francisco)") FROM table_2960 WHERE "Vehicle" = 'Nissan Leaf'
SELECT COUNT("Clean electric grid California (San Francisco)") FROM "table_2960" WHERE "Vehicle" = 'Nissan Leaf'