List down the states in 2011 with a national sector average of 20 and below.
in 2011 refers to year = '2011'; national sector average of 20 and below refers to awards_per_natl_value < 20;
SELECT DISTINCT T1.state FROM state_sector_details AS T1 INNER JOIN state_sector_grads AS T2 ON T2.stateid = T1.stateid WHERE T2.year = 2011 AND T1.awards_per_natl_value <= 20