Year	Number
2004-01-01	215.5207
2005-01-01	364.3091
2006-01-01	376.9120
2007-01-01	473.1526
2008-01-01	485.0638
2009-01-01	552.2066
2010-01-01	624.1921
2011-01-01	757.7924
2012-01-01	903.9296
2013-01-01	1076.1312
2014-01-01	1299.1610
2015-01-01	1425.9769
2016-01-01	1567.7685