Year	Number
2007-01-01	29509879
2008-01-01	31311312
2009-01-01	33883423
2010-01-01	36739480
2011-01-01	41792490
2012-01-01	47875628
2013-01-01	52063826
2014-01-01	54583494
2015-01-01	54708598
2016-01-01	55745660