CREATE TABLE table_64291 ("Year" FLOAT, "Political Rights" FLOAT, "Civil Liberties" FLOAT, "Status" TEXT, "President" TEXT)

When the president was Yoweri Museveni, and the year was 1993, with rank of 6 under political rights, what was the total of civil liberties?
SELECT SUM("Civil Liberties") FROM table_64291 WHERE "Political Rights" = '6' AND "President" = 'yoweri museveni' AND "Year" = '1993'
SELECT SUM("Civil Liberties") FROM "table_64291" WHERE "Political Rights" = '6' AND "President" = 'yoweri museveni' AND "Year" = '1993'