Year	Number
2004-01-01	16.1649
2005-01-01	16.3443
2006-01-01	18.2212
2007-01-01	21.3223
2008-01-01	25.8743
2009-01-01	28.3780
2010-01-01	31.3736
2011-01-01	30.7403
2012-01-01	34.4545
2013-01-01	34.3204
2014-01-01	33.9139
2015-01-01	33.8039
2016-01-01	33.4090