CREATE TABLE table_203_872 (id DECIMAL, "year" DECIMAL, "location ( s ) " TEXT, "number of contestants" DECIMAL, "ladies winner" TEXT, "men's winner" TEXT)

what is the total number of contestants that participated in 1972 ?
SELECT "number of contestants" FROM table_203_872 WHERE "year" = 1972
SELECT "number of contestants" FROM "table_203_872" WHERE "year" = 1972