CREATE TABLE table_10797463_1 (village__german_ VARCHAR2, percent_of_slovenes_1991 VARCHAR2)

How many villages had 21.7% of slovenes in 1991?
SELECT COUNT(village__german_) FROM table_10797463_1 WHERE percent_of_slovenes_1991 = "21.7%"
SELECT COUNT("village__german_") FROM "table_10797463_1" WHERE "21.7%" = "percent_of_slovenes_1991"