Year	Number
2004-01-01	45.3866
2005-01-01	45.1517
2006-01-01	41.3555
2007-01-01	46.8226
2008-01-01	47.4137
2009-01-01	48.8194
2010-01-01	52.3205
2011-01-01	55.3747
2012-01-01	60.4263
2013-01-01	59.1951
2014-01-01	56.3692
2015-01-01	57.0847
2016-01-01	57.4880
2017-01-01	58.8249