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_2970978_1 (ave_attendance VARCHAR, ___ave_on_prev_season VARCHAR)
### Question:
How many values of attendance occur when ave. on previous season is +645?
### Answer:
SELECT COUNT(ave_attendance) FROM table_2970978_1 WHERE ___ave_on_prev_season = "+645"