before 1990 what was the highest percentage of popular vote ?
CREATE TABLE table_203_330 (
    id number,
    "year of election" number,
    "candidates elected" number,
    "# of seats available" number,
    "# of votes" number,
    "% of popular vote" text
)
SELECT MAX("% of popular vote") FROM table_203_330 WHERE "year of election" < 1990
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: before 1990 what was the highest percentage of popular vote ? ### Input: CREATE TABLE table_203_330 (
    id number,
    "year of election" number,
    "candidates elected" number,
    "# of seats available" number,
    "# of votes" number,
    "% of popular vote" text
) ### Response: SELECT MAX("% of popular vote") FROM table_203_330 WHERE "year of election" < 1990