CREATE TABLE table_16308 ("Village  ( German ) " TEXT, "Village  ( Slovenian ) " TEXT, "Number of people 1991" FLOAT, "Percent of Slovenes 1991" TEXT, "Percent of Slovenes 1951" TEXT)

How many villages had 21.7% of slovenes in 1991?
SELECT COUNT("Village (German)") FROM table_16308 WHERE "Percent of Slovenes 1991" = '21.7%'
SELECT COUNT("Village (German)") FROM "table_16308" WHERE "Percent of Slovenes 1991" = '21.7%'