Year	Number
2004-01-01	22.6066
2005-01-01	22.6649
2006-01-01	22.6537
2007-01-01	21.8726
2008-01-01	21.5824
2009-01-01	21.4183
2010-01-01	19.5184
2011-01-01	19.3196
2012-01-01	18.8667
2013-01-01	18.0824
2014-01-01	17.2429
2015-01-01	15.9174
2016-01-01	13.5867