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_19948664_1 (countries_sampled INTEGER, index__year_ VARCHAR)
### Question:
How many countries were sampled for the Prosperity Index (2008)?
### Answer:
SELECT MAX(countries_sampled) FROM table_19948664_1 WHERE index__year_ = "Prosperity Index (2008)"