user: Question: How many people in 1991 have a Village (German) of rupertiberg?
Columns: ['Village (German)', 'Village (Slovene)', 'Number of people 1991', 'Percent of Slovenes 1991', 'Percent of Slovenes 1951']
Types: ['text', 'text', 'real', 'text', 'text']
Sample row: ['Bach', 'Potok', 104.0, '15.4%', '98.6%']
SQL:

assistant: SELECT "Number of people 1991" FROM "Table" WHERE "Village (German)" = 'rupertiberg';