Year	Number
2005-01-01	12.9427
2006-01-01	14.0529
2007-01-01	15.3202
2008-01-01	17.1564
2009-01-01	17.3352
2010-01-01	17.8761
2011-01-01	18.2380
2012-01-01	18.6219
2013-01-01	19.6709
2014-01-01	19.6373
2015-01-01	19.1993
2016-01-01	18.1398
2017-01-01	17.7391