Year	Number
2004-01-01	138.475096039438
2005-01-01	179.702241321313
2006-01-01	222.806606326032
2007-01-01	261.101265094760
2008-01-01	270.086928072808
2009-01-01	257.803390450118
2010-01-01	263.953227234992
2011-01-01	301.463578144947
2012-01-01	301.137730624549
2013-01-01	335.196326758517
2014-01-01	382.768232324388
2015-01-01	420.480329668105