How To Add Count To End Of Report

I want to export records from the customer table then the final record needs to be a count of all records exported.I am always recieving an error - All queries combined using a UNION, INTERSECT or EXCEPT operator must have an equal number of expressions in their target lists.

SELECT
CUSTTABLE.ACCOUNTNUM
,CUSTTABLE.NAME
,CUSTTABLE.BLOCKED
,CUSTTABLE.DATAAREAID
FROM
CUSTTABLE
where blocked!='2'
UNION
SELECT COUNT(ACCOUNTNUM) AS TRAILER FROM CUSTTABLE
WHERE blocked!='2';

Each different select statement works fine on its own but not when i combine them together with the union