Year	Number
2004-01-01	1.8883
2005-01-01	2.1859
2006-01-01	3.2221
2007-01-01	3.5823
2008-01-01	4.1510
2009-01-01	4.6026
2010-01-01	5.5767
2011-01-01	6.3006
2012-01-01	6.8075
2013-01-01	7.4887
2014-01-01	8.8763
2015-01-01	10.2670
2016-01-01	10.5862
2017-01-01	9.2298