Question: What year had a score of 0.586?
SQL: SELECT COUNT("Year") FROM "2-18962637-1" WHERE "Score" = '0.586';

Question: What's the n Africa in 2012 with an N/A as the CPLP?
SQL: SELECT "n Africa rank" FROM "2-18962637-1" WHERE "Year" = 2012.0 AND "CPLP rank" = 'N/A';