CREATE TABLE table_name_48 (_percentage__1960_ NUMBER, county VARCHAR2, _percentage__2040_ VARCHAR2, _percentage__2000_ VARCHAR2)

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