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_21690339_1 (_percentage_cut VARCHAR, gas_storage VARCHAR)

### Question ###
What wast the percent cut for the nation with an 80% full gas storage?

### Accurate SQL ###

SELECT _percentage_cut FROM table_21690339_1 WHERE gas_storage = "80% full"