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_400 ( id number, "district" text, "vacator" text, "reason for change" text, "successor" text, "date successor\nseated" text )

### Question ###
how many of the changes happened before june of 1986 ?

### Accurate SQL ###

SELECT COUNT(*) FROM table_203_400 WHERE "date successor\nseated" < 1986 OR ("date successor\nseated" = 1986 AND "date successor\nseated" < 6)