CREATE TABLE table_30762 ("Player" TEXT, "County" TEXT, "Balls" FLOAT, "Wickets" FLOAT, "Average" TEXT, "Economy" TEXT, "BBI" TEXT, "4wi" FLOAT, "5wi" FLOAT)

How many wickets was there when the economy was 3.64?
SELECT "Wickets" FROM table_30762 WHERE "Economy" = '3.64'
SELECT "Wickets" FROM "table_30762" WHERE "Economy" = '3.64'