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

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