CREATE TABLE table_name_59 (average INTEGER, games VARCHAR(255), w_l_t VARCHAR(255), season VARCHAR(255))
Which Average that has a W-L-T of 5-1, and a Season smaller than 2001, and Games smaller than 6?
    
SQL: SELECT AVG(average) FROM table_name_59 WHERE w_l_t = "5-1" AND season < 2001 AND games < 6