Year Number per 1,000 adults 2009-01-01 74.29340000000000 2010-01-01 100.69300000000000 2011-01-01 153.14900000000000 2012-01-01 201.54000000000000 2013-01-01 251.47099999999998 2014-01-01 326.09900000000000 2015-01-01 472.20800000000000 2016-01-01 510.54100000000000