What is the greatest 2007 when the change 06-07 was 14.7%?
CREATE TABLE "patronage_ridership" (
  "type_of_service" text,
  "2006" real,
  "2007" real,
  "2008" real,
  "change_06_07" text,
  "change_07_08" text
);
SELECT MAX("2007") FROM "patronage_ridership" WHERE "change_06_07"='14.7%';