CREATE TABLE table_203_330 (id DECIMAL, "year of election" DECIMAL, "candidates elected" DECIMAL, "# of seats available" DECIMAL, "# of votes" DECIMAL, "% of popular vote" TEXT)

before 1990 what was the highest percentage of popular vote ?
SELECT MAX("% of popular vote") FROM table_203_330 WHERE "year of election" < 1990
SELECT MAX("% of popular vote") FROM "table_203_330" WHERE "year of election" < 1990