Year	Number
2004-01-01	67.0234
2005-01-01	68.1351
2006-01-01	69.8902
2007-01-01	70.3923
2008-01-01	68.7300
2009-01-01	65.1774
2010-01-01	63.1386
2011-01-01	61.0472
2012-01-01	58.7085
2013-01-01	56.1324
2014-01-01	53.9915
2015-01-01	51.8175
2016-01-01	49.8318
2017-01-01	50.4594