CREATE TABLE table_66094 ("Pinn. Rank" FLOAT, "Std. Rank" FLOAT, "Name" TEXT, "Pinnacle height ft  ( m ) " TEXT, "Standard height ft  ( m ) " TEXT, "Floors" FLOAT, "Year" FLOAT)

How much Standard Rank has a Name of 311 south wacker drive, and a Year larger than 1990?
SELECT SUM("Std. Rank") FROM table_66094 WHERE "Name" = '311 south wacker drive' AND "Year" > '1990'
SELECT SUM("Std. Rank") FROM "table_66094" WHERE "Name" = '311 south wacker drive' AND "Year" > '1990'