Year	Number
2004-01-01	45.3829
2005-01-01	51.2612
2006-01-01	57.9754
2007-01-01	94.6329
2008-01-01	101.8979
2009-01-01	105.0369
2010-01-01	112.7583
2011-01-01	117.6420
2012-01-01	117.7486
2013-01-01	125.2477
2014-01-01	132.5959
2015-01-01	134.4293
2016-01-01	138.5592
2017-01-01	146.1733