Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_50418 ( "City" text, "State" text, "2010 population" text, "Peak population (year)" text, "Numeric decline from peak population" text, "Percent decline from peak population" text )

### Question ###
what is the percent decline from peak population when the peak population (year) is 178320 (1960)?

### Accurate SQL ###

SELECT "Percent decline from peak population" FROM table_50418 WHERE "Peak population (year)" = '178320 (1960)'