CREATE TABLE table_17226 ("State" CLOB, "Norwegian Americans  ( 1980 ) " FLOAT, "Percent  ( 1980 ) " CLOB, "Norwegian Americans  ( 1990 ) " FLOAT, "Percent  ( 1990 ) " CLOB, "Norwegian Americans  ( 2000 ) " FLOAT, "Percent  ( 2000 ) " CLOB, "Norwegian Americans  ( 2009 ) " FLOAT, "Percent  ( 2009 ) " CLOB)

what are all the percent (1990) where state is united states
SELECT "Percent (1990)" FROM table_17226 WHERE "State" = 'United States'
SELECT "Percent (1990)" FROM "table_17226" WHERE "State" = 'United States'