CREATE TABLE table_28640 ("Rank" FLOAT, "Couple" CLOB, "Judges" FLOAT, "Public" FLOAT, "Total" FLOAT, "Vote percentage" CLOB, "Result" CLOB)

How many times was the vote percentage 15.0%?
SELECT COUNT("Total") FROM table_28640 WHERE "Vote percentage" = '15.0%'
SELECT COUNT("Total") FROM "table_28640" WHERE "Vote percentage" = '15.0%'