Year	Number
2006-01-01	15.7027
2007-01-01	20.8357
2008-01-01	28.6467
2009-01-01	43.1247
2010-01-01	35.0131
2011-01-01	38.6104
2012-01-01	41.5579
2013-01-01	44.6101
2014-01-01	46.8430
2015-01-01	49.9002
2016-01-01	50.1208
2017-01-01	51.0158