CREATE TABLE table_20988 ("Year" FLOAT, "Starts" FLOAT, "Wins" FLOAT, "Top 5" FLOAT, "Top 10" FLOAT, "Poles" FLOAT, "Avg. Start" TEXT, "Avg. Finish" TEXT, "Winnings" TEXT, "Position" TEXT, "Team ( s ) " TEXT)

name the total number of top 10 also where the position is 51st
SELECT COUNT("Top 10") FROM table_20988 WHERE "Position" = '51st'
SELECT COUNT("Top 10") FROM "table_20988" WHERE "Position" = '51st'