How many clean electric grid california (san francisco) figures are given for the Nissan Leaf?
CREATE TABLE table_23840623_4 (
    clean_electric_grid_california__san_francisco_ VARCHAR,
    vehicle VARCHAR
)
SELECT COUNT(clean_electric_grid_california__san_francisco_) FROM table_23840623_4 WHERE vehicle = "Nissan Leaf"
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: How many clean electric grid california (san francisco) figures are given for the Nissan Leaf? ### Input: CREATE TABLE table_23840623_4 (
    clean_electric_grid_california__san_francisco_ VARCHAR,
    vehicle VARCHAR
) ### Response: SELECT COUNT(clean_electric_grid_california__san_francisco_) FROM table_23840623_4 WHERE vehicle = "Nissan Leaf"