Year Number per 100,000 adults 2004-01-01 1.7328800000000000 2005-01-01 1.8343500000000000 2006-01-01 1.9022599999999998 2007-01-01 1.9517000000000000 2008-01-01 1.9383700000000001 2009-01-01 1.9330700000000000 2010-01-01 1.8405900000000002 2011-01-01 1.7562099999999998 2012-01-01 1.6983700000000002 2013-01-01 1.6709900000000002 2014-01-01 1.6447400000000000 2015-01-01 1.5941500000000000