What is the 2006 value with a 2011 value greater than 4113 and a 2008 value less than 7181?
CREATE TABLE "romanian_agricultural_research" (
  "production_year" text,
  "2001" real,
  "2002" real,
  "2003" real,
  "2004" real,
  "2005" real,
  "2006" real,
  "2007" real,
  "2008" real,
  "2009" real,
  "2010" real,
  "2011" real
);
SELECT SUM("2006") FROM "romanian_agricultural_research" WHERE "2011">4113 AND "2008"<7181;