Year	Number
2004-01-01	16.2341
2005-01-01	22.8179
2006-01-01	32.4338
2007-01-01	45.0168
2008-01-01	61.6050
2009-01-01	72.3899
2010-01-01	95.5444
2011-01-01	116.8919
2012-01-01	142.0036
2013-01-01	156.5062
2014-01-01	185.3242
2015-01-01	172.6046
2016-01-01	168.6977