Table schema:
CREATE TABLE table_name_48 (_percentage__1960_ INTEGER, county VARCHAR, _percentage__2040_ VARCHAR, _percentage__2000_ VARCHAR)

Question: What is the % (1960) of Troms, which has a % (2040) smaller than 100 and a % (2000) smaller than 4.7?
SQL: SELECT SUM(_percentage__1960_) FROM table_name_48 WHERE _percentage__2040_ < 100 AND _percentage__2000_ < 4.7 AND county = "troms"