CREATE TABLE table_27956 ("meas. num." FLOAT, "passed" TEXT, "YES votes" FLOAT, "NO votes" FLOAT, "% YES" TEXT, "Const. Amd.?" TEXT, "type" TEXT, "description" TEXT)

How many type catagories are listed when the percentage of yes is 68.91%?
SELECT COUNT("type") FROM table_27956 WHERE "% YES" = '68.91%'
SELECT COUNT("type") FROM "table_27956" WHERE "% YES" = '68.91%'