Year	Number
2004-01-01	17.9427
2005-01-01	17.7200
2006-01-01	17.3664
2007-01-01	27.6276
2008-01-01	30.2599
2009-01-01	32.6542
2010-01-01	33.3784
2011-01-01	34.0906
2012-01-01	34.5812
2013-01-01	34.8241
2014-01-01	34.5577
2015-01-01	34.3886
2016-01-01	33.3488
2017-01-01	33.4801