Question: How many years have HMOs been 27% and POS plans 18%?
SQL: SELECT COUNT("Year") FROM "2-15343730-1" WHERE "HMOs" = '27%' AND "POS plans" = '18%';

Question: Which conventional plan has a POS of 13%?
SQL: SELECT "Conventional plans" FROM "2-15343730-1" WHERE "POS plans" = '13%';

Question: How many years have a conventional plan of 7%?
SQL: SELECT SUM("Year") FROM "2-15343730-1" WHERE "Conventional plans" = '7%';

Question: Which conventional plan has a POS plan of 21%?
SQL: SELECT "Conventional plans" FROM "2-15343730-1" WHERE "POS plans" = '21%';

Question: Which HMO has a conventional plan of 3% in 2005?
SQL: SELECT "HMOs" FROM "2-15343730-1" WHERE "Conventional plans" = '3%' AND "Year" = 2005.0;