2006 of 10–4 is in which 2000?
CREATE TABLE "grand_slam_tournaments" (
  "tournament" text,
  "1998" text,
  "2000" text,
  "2001" text,
  "2002" text,
  "2003" text,
  "2004" text,
  "2005" text,
  "2006" text,
  "2007" text,
  "2008" text,
  "2009" text,
  "2010" text,
  "2011" text,
  "2012" text,
  "2013" text
);
SELECT "2000" FROM "grand_slam_tournaments" WHERE "2006"='10–4';