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_23614702_1 ( built_year VARCHAR, tons___lton__ VARCHAR )

### Question ###
In how many different years was the warship that weights 1130 tons built?

### Accurate SQL ###

SELECT COUNT(built_year) FROM table_23614702_1 WHERE tons___lton__ = 1130