Year	Number
2004-01-01	0.1095
2005-01-01	0.1773
2006-01-01	0.2242
2007-01-01	0.4536
2008-01-01	0.9072
2009-01-01	1.6423
2010-01-01	1.4599
2011-01-01	2.3983
2012-01-01	3.1804
2013-01-01	4.2649
2014-01-01	5.2033
2015-01-01	6.4442
2016-01-01	6.7779
2017-01-01	7.3670