CREATE TABLE table_60533 ("Data" CLOB, "Headcount" FLOAT, "Percent of total" CLOB, "Less than $25 , 000" CLOB, "$25 , 000 to $40 , 000" CLOB, "$40 , 000 to $50 , 000" CLOB, "$50 , 000 to $60 , 000" CLOB, "$60 , 000 to $70 , 000" CLOB, "$70 , 000 to $80 , 000" CLOB, "More than $80 , 000" CLOB, "Mean" CLOB)

What's the sum of the headcounts that have an n/a value of $60k to $70K?
SELECT SUM("Headcount") FROM table_60533 WHERE "$60,000 to $70,000" = 'n/a'
SELECT SUM("Headcount") FROM "table_60533" WHERE "$60,000 to $70,000" = 'n/a'