Year	Number
2004-01-01	7.8238
2005-01-01	6.7134
2006-01-01	7.2418
2007-01-01	8.4561
2008-01-01	12.2901
2009-01-01	14.8719
2010-01-01	16.4258
2011-01-01	17.2790
2012-01-01	17.5214
2013-01-01	18.1273
2014-01-01	20.8064
2015-01-01	22.2094
2016-01-01	22.6166