Year	Number
2004-01-01	46.7137
2005-01-01	60.2522
2006-01-01	59.9946
2007-01-01	52.5138
2008-01-01	77.3660
2009-01-01	95.1884
2010-01-01	110.9175
2011-01-01	124.0242
2012-01-01	134.0412
2013-01-01	148.5443
2014-01-01	162.2538
2015-01-01	168.2642
2016-01-01	182.6171