Year	Number
2004-01-01	67.5018
2005-01-01	62.7620
2006-01-01	60.7731
2007-01-01	60.6878
2008-01-01	61.1839
2009-01-01	60.2775
2010-01-01	57.9768
2011-01-01	55.5743
2012-01-01	52.1545
2013-01-01	39.2778
2014-01-01	37.8683
2015-01-01	36.1721
2016-01-01	34.3370
2017-01-01	50.8886