Year	Number
2004-01-01	7.519472475
2005-01-01	12.351711560
2006-01-01	14.123080740
2007-01-01	14.051333750
2008-01-01	14.520151830
2009-01-01	10.680149810
2010-01-01	8.685262587
2011-01-01	6.341904517
2012-01-01	6.375013886
2013-01-01	6.003126430
2014-01-01	4.822184863