Year	Number
2004-01-01	20419708
2005-01-01	24929801
2006-01-01	26222485
2007-01-01	27254875
2008-01-01	28680977
2009-01-01	30203145
2010-01-01	37237045
2011-01-01	33823250
2012-01-01	35787845
2013-01-01	49540255
2014-01-01	54500513
2015-01-01	59811981
2016-01-01	65823060