Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_29789_3 (_percentage_change VARCHAR, international_tourism_expenditure_2012 VARCHAR)
### Question:
How many countries spent $83.7 billion on international tourism in 2012?
### Answer:
SELECT COUNT(_percentage_change) FROM table_29789_3 WHERE international_tourism_expenditure_2012 = "$83.7 billion"