Year	Number
2006-01-01	6578054
2007-01-01	7501767
2008-01-01	8395159
2009-01-01	9438334
2010-01-01	10788162
2011-01-01	12397321
2012-01-01	14014421
2013-01-01	15929889
2014-01-01	18189093
2015-01-01	20671944
2016-01-01	23360729