Global rare earth metal market was valued at around USD 5.0 billion in 2014 and is expected to reach USD 9.0 billion in 2020, growing at a double digit CAGR between 2015 and 2020.
http://www.mynewsdesk.com/us/pressreleases/rare-earth-metals-market-on-a-global-and-regional-level-the-study-provides-historic-data-of-2014-along-with-a-forecast-from-2015-to-2020-1392881