Year	Number
2004-01-01	13.66061600
2005-01-01	16.11767265
2006-01-01	14.95425497
2007-01-01	12.72030618
2008-01-01	15.79510136
2009-01-01	17.11448289
2010-01-01	16.65543135
2011-01-01	18.85176830
2012-01-01	19.89482532
2013-01-01	21.70615240
2014-01-01	17.53373829