Give me the minimum number of people in 1991 with 92.5% of Slovenes in 1991.
create table table_10798421_1 (number_of_people_1991 integer, percent_of_slovenes_1991 varchar, PRIMARY KEY (number_of_people_1991))
select min(number_of_people_1991) from table_10798421_1 where percent_of_slovenes_1991 = "92.5%"