How many places did the rank change since 22006 for County Leitrim? 
CREATE TABLE "see_also" (
  "rank_2011" real,
  "change_since_2006" text,
  "urban_area" text,
  "county" text,
  "population_2011" real,
  "increase_since_2006" text
);
SELECT COUNT("change_since_2006") FROM "see_also" WHERE "county"='County Leitrim';