Year	Number
2004-01-01	114.5986
2005-01-01	175.1771
2006-01-01	249.3985
2007-01-01	327.1735
2008-01-01	357.8576
2009-01-01	328.1849
2010-01-01	327.4035
2011-01-01	345.6124
2012-01-01	394.3526
2013-01-01	416.7230
2014-01-01	429.2082
2015-01-01	421.0791
2016-01-01	408.3490
2017-01-01	428.5831