api.census.gov/data/2014/pep/projpop?get=POP,YEAR&for=us:1&key=YOUR_KEY_GOES_HERE
api.census.gov/data/2014/pep/projagegroups?get=DATE_DESC,POP,DATE_&for=us:1&key=YOUR_KEY_GOES_HERE
api.census.gov/data/2014/pep/projnat?get=YEAR,POP&for=us:1&key=YOUR_KEY_GOES_HERE