What is the average 2007 value with a 2009 value greater than 2.8, a 4.9 in 2010, and a 2006 less than 2.5?
CREATE TABLE "economic_profile" (
  "geographic_unit" text,
  "2006" real,
  "2007" real,
  "2008" real,
  "2009" real,
  "2010" real,
  "2011" real
);
SELECT AVG("2007") FROM "economic_profile" WHERE "2009">2.8 AND "2010"=4.9 AND "2006"<2.5;