If the polling average in July 2009 was 7.2%, what was it in May 2009?
CREATE TABLE "average_polling" (
  "party" text,
  "result_parliam_election_2005" text,
  "result_county_elections_2007" text,
  "aug_2008" text,
  "sep_2008" text,
  "oct_2008" text,
  "nov_2008" text,
  "dec_2008" text,
  "jan_2009" text,
  "feb_2009" text,
  "mar_2009" text,
  "apr_2009" text,
  "may_2009" text,
  "jun_2009" text,
  "jul_2009" text,
  "aug_2009" text
);
SELECT "may_2009" FROM "average_polling" WHERE "jul_2009"='7.2%';