CREATE TABLE table_18858 ("District" TEXT, "2012 Commission" TEXT, "2010 Commission" TEXT, "2007 Commission" TEXT, "2002 Commission" TEXT, "1999 Commission" TEXT)

Who was on the 2012 commission and the 1999 commission with john wilborn?
SELECT "2012 Commission" FROM table_18858 WHERE "1999 Commission" = 'John Wilborn'
SELECT "2012 Commission" FROM "table_18858" WHERE "1999 Commission" = 'John Wilborn'