What is the 2009 first time percentage of the mg general science 5-9 exam with a 2008 first time percentage of 54%?
CREATE TABLE "passing_rates" (
  "exam" text,
  "2006_first_time" text,
  "2006_all" text,
  "2007_first_time" text,
  "2007_all" text,
  "2008_first_time" text,
  "2008_all" text,
  "2009_first_time" text,
  "2009_all" text,
  "2010_first_time" text,
  "2011_first_time" text,
  "2012_first_time" text
);
SELECT "2009_first_time" FROM "passing_rates" WHERE "2008_first_time"='54%' AND "exam"='mg general science 5-9';