user: Question: How many villages had 21.7% of slovenes in 1991?
Columns: ['Village (German)', 'Village (Slovenian)', 'Number of people 1991', 'Percent of Slovenes 1991', 'Percent of Slovenes 1951']
Types: ['text', 'text', 'real', 'text', 'text']
Sample row: ['Neusaß', 'Vesava', 48.0, '45.8%', '100%']
SQL:

assistant: SELECT COUNT("Village (German)") FROM "Table" WHERE "Percent of Slovenes 1991" = '21.7%';