CREATE TABLE table_name_54 (n_africa_rank VARCHAR, year VARCHAR, cplp_rank VARCHAR)

What's the n Africa in 2012 with an N/A as the CPLP?
SELECT n_africa_rank FROM table_name_54 WHERE year = 2012 AND cplp_rank = "n/a"
SELECT "n_africa_rank" FROM "table_name_54" WHERE "cplp_rank" = "n/a" AND "year" = 2012