Year	Number
2004-01-01	11.4144
2005-01-01	11.9107
2006-01-01	13.6476
2007-01-01	16.3772
2008-01-01	20.3474
2009-01-01	22.8288
2010-01-01	25.8065
2011-01-01	25.8065
2012-01-01	29.5285
2013-01-01	30.0248
2014-01-01	30.2730
2015-01-01	30.7692
2016-01-01	31.0174