Year	Number
2004-01-01	19.4597
2005-01-01	27.6615
2006-01-01	32.4400
2007-01-01	32.5528
2008-01-01	32.4473
2009-01-01	25.3876
2010-01-01	20.7703
2011-01-01	17.2107
2012-01-01	16.0047
2013-01-01	13.9964
2014-01-01	13.8257
2015-01-01	13.2633
2016-01-01	14.4533