Year	Number
2004-01-01	186.2578
2005-01-01	197.9806
2006-01-01	206.2274
2007-01-01	195.1015
2008-01-01	188.6342
2009-01-01	187.3860
2010-01-01	180.1116
2011-01-01	175.8083
2012-01-01	155.1827
2013-01-01	188.7152
2014-01-01	199.1919
2015-01-01	202.1968
2016-01-01	210.9896
2017-01-01	214.1613