CREATE TABLE table_59596 ("Rank" TEXT, "County" TEXT, "State" TEXT, "Land area  ( km\\u00b2 ) " TEXT, "Land area  ( mi\\u00b2 ) " TEXT, "April 1 ,  2010 census" TEXT, "April 1 ,  2010 density  ( /km\\u00b2 ) " TEXT, "April 1 ,  2010 density  ( /mi\\u00b2 ) " TEXT, "July 1 ,  2010 official estimate" TEXT, "July 1 ,  2010 density  ( /km\\u00b2 ) " TEXT, "July 1 ,  2010 density  ( /mi\\u00b2 ) " TEXT, "July 1 ,  2011 official estimate" TEXT, "July 1 ,  2011 density  ( /km\\u00b2 ) " TEXT, "July 1 ,  2011 density  ( /mi\\u00b2 ) " TEXT, "Mid-2010 to mid-2011 change  ( Absolute ) " TEXT, "Mid-2010 to mid-2011 change  ( % ) " TEXT, "County seat or courthouse" TEXT)

What is the mid-2010 to mid-2011 change where the July 1, 2011 density is 508?
SELECT "Mid-2010 to mid-2011 change (%)" FROM table_59596 WHERE "July 1, 2011 density (/mi\u00b2)" = '508'
SELECT "Mid-2010 to mid-2011 change (%)" FROM "table_59596" WHERE "July 1, 2011 density (/mi\u00b2)" = '508'