human
Considering the provided database schema and associated query, produce SQL code to retrieve the answer to the query. 
###Database Schema: Year, Competition, Wins, Draws, Loses
###Question: What sum of Losses has Year greater than 1972, and Competition of nswrfl, and Draws 0, and Wins 16?
gpt
SELECT SUM Loses FROM table WHERE Year > 1972 AND Competition = nswrfl AND Draws = 0 AND Wins = 16