How many countries spent at least $51.0 billion in international tourism in 2012?
CREATE TABLE table_31340 (
    "Rank 2012" real,
    "Country" text,
    "UNWTO Region" text,
    "International tourism expenditure 2011" text,
    "International tourism expenditure 2012" text,
    "% change" text
)
SELECT MAX("Rank 2012") FROM table_31340 WHERE "International tourism expenditure 2011" = '$51.0 billion'
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 countries spent at least $51.0 billion in international tourism in 2012? ### Input: CREATE TABLE table_31340 (
    "Rank 2012" real,
    "Country" text,
    "UNWTO Region" text,
    "International tourism expenditure 2011" text,
    "International tourism expenditure 2012" text,
    "% change" text
) ### Response: SELECT MAX("Rank 2012") FROM table_31340 WHERE "International tourism expenditure 2011" = '$51.0 billion'