What's the 2006 if there's less than 6.7 in 2007 and less than 3.4 in 2009?
CREATE TABLE "popularity_of_terrestrial_tv_stations" (
  "tv_station_operator" text,
  "2005" real,
  "2006" real,
  "2007" real,
  "2008" real,
  "2009" real,
  "2010" real,
  "2011_1_h" real
);
SELECT SUM("2006") FROM "popularity_of_terrestrial_tv_stations" WHERE "2007"<6.7 AND "2009"<3.4;