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_31610 ( "Year of election" real, "Candidates elected" real, "# of seats available" real, "# of votes" text, "% of popular vote" text )

### Question ###
What is the percentage of the popular vote when there were 90 seats available?

### Accurate SQL ###

SELECT "% of popular vote" FROM table_31610 WHERE "# of seats available" = '90'