Year	Number
2004-01-01	8.3722
2005-01-01	9.6579
2006-01-01	10.8617
2007-01-01	13.9639
2008-01-01	15.3911
2009-01-01	17.7427
2010-01-01	20.4615
2011-01-01	21.5277
2012-01-01	22.2386
2013-01-01	23.1443
2014-01-01	24.4693
2015-01-01	26.3638
2016-01-01	27.4409