Year	Number
2004-01-01	11.3696
2005-01-01	8.4865
2006-01-01	11.4027
2007-01-01	15.3596
2008-01-01	18.9063
2009-01-01	20.7724
2010-01-01	22.3394
2011-01-01	26.3465
2012-01-01	31.3776
2013-01-01	36.6752
2014-01-01	45.6804
2015-01-01	42.7713