Year	Number
2004-01-01	18702835
2005-01-01	22572280
2006-01-01	24867264
2007-01-01	24298539
2008-01-01	25275417
2009-01-01	28166803
2010-01-01	29412139
2011-01-01	32311931
2012-01-01	39780794
2013-01-01	43821743
2014-01-01	47308481
2015-01-01	49817585
2016-01-01	56848597
2017-01-01	59829292