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_203_609 ( id number, "#" number, "matters" text, "sections of the constitution allowing their institution" text, "eligible petitioners" text, "type" text )

### Question ###
how many matters require at least one tenth of the existing representatives or senators ?

### Accurate SQL ###

SELECT COUNT("matters") FROM table_203_609 WHERE "eligible petitioners" = 'at least one tenth of the existing representatives or senators'