CREATE TABLE table_name_98 (percent_decline_from_peak_population VARCHAR, peak_population__year_ VARCHAR)

what is the percent decline from peak population when the peak population (year) is 178320 (1960)?
SELECT percent_decline_from_peak_population FROM table_name_98 WHERE peak_population__year_ = "178320 (1960)"
SELECT "percent_decline_from_peak_population" FROM "table_name_98" WHERE "178320 (1960)" = "peak_population__year_"