CREATE TABLE table_20686 ("Year" FLOAT, "Starts" FLOAT, "Wins" FLOAT, "Top 10" FLOAT, "Avg. Start" TEXT, "Avg. Finish" TEXT, "Winnings" TEXT, "Position" TEXT, "Team ( s ) " TEXT)

How many years did he have an average finish of 29.2?
SELECT COUNT("Winnings") FROM table_20686 WHERE "Avg. Finish" = '29.2'
SELECT COUNT("Winnings") FROM "table_20686" WHERE "Avg. Finish" = '29.2'