CREATE TABLE table_21480 ("Year" FLOAT, "West Manila" TEXT, "East Manila" TEXT, "Consumer Price Index  ( 2005 = 100 ) " TEXT, "West Manila as a share of 1996 real tariff" TEXT, "East Manila as a share of 1996 real tariff" TEXT)

What was the year when West Manila has a tariff increase of 6.5?
SELECT "Year" FROM table_21480 WHERE "West Manila" = '6.5'
SELECT "Year" FROM "table_21480" WHERE "West Manila" = '6.5'