Year	Number
2004-01-01	31.8622
2005-01-01	32.7390
2006-01-01	34.0524
2007-01-01	35.5586
2008-01-01	37.1180
2009-01-01	38.1495
2010-01-01	38.8416
2011-01-01	37.8388
2012-01-01	38.2010
2013-01-01	37.7566
2014-01-01	37.6655
2015-01-01	38.3796
2016-01-01	39.0545
2017-01-01	41.4287