Table schema:
CREATE TABLE table_name_31 (season INTEGER, points VARCHAR, driver VARCHAR, percentage_of_possible_points VARCHAR)

Question: How many seasons have fernando alonso as the driver, and a percentage of possible points of 64.12% and points less than 109?
SQL: SELECT SUM(season) FROM table_name_31 WHERE driver = "fernando alonso" AND percentage_of_possible_points = "64.12%" AND points < 109