Table: race_stats_36
Columns: year
starts
wins
top_5
top_10
poles
avg_start
avg_finish
winnings
position

Question: What is the average year with an average start smaller than 6.3 and fewer than 0 wins?
SQL: SELECT AVG("year") FROM race_stats_36 WHERE "avg_start" < 6.3 AND "wins" < 0