Tell me the lowest 2005 for 2010 less than 21 for 2009 being 19
CREATE TABLE "ranking_of_chinese_provinces_by_gdp_per_" (
  "year" text,
  "2010" real,
  "2009" real,
  "2008" real,
  "2005" real,
  "2000" real
);
SELECT MIN("2005") FROM "ranking_of_chinese_provinces_by_gdp_per_" WHERE "2009"=19 AND "2010"<21;