Year	Number
2004-01-01	32.2234
2005-01-01	30.7155
2006-01-01	27.6223
2007-01-01	21.5905
2008-01-01	17.0447
2009-01-01	13.0135
2010-01-01	13.8387
2011-01-01	31.6989
2012-01-01	37.1837
2013-01-01	37.6604
2014-01-01	38.9441
2015-01-01	38.6651
2016-01-01	42.6025
2017-01-01	47.0920