What 2006 has grand slam tournaments of 2005?
CREATE TABLE "grand_slam_singles_performance_timeline" (
  "tournament" text,
  "2002" text,
  "2004" text,
  "2005" text,
  "2006" text,
  "2007" text,
  "2008" text,
  "2010" text,
  "2011" text,
  "2012" text
);
SELECT "2006" FROM "grand_slam_singles_performance_timeline" WHERE "2005"='grand slam tournaments';