Year	Number
2004-01-01	25165612
2005-01-01	28860112
2006-01-01	29992198
2007-01-01	34608889
2008-01-01	36021618
2009-01-01	38719754
2010-01-01	40554790
2011-01-01	43966632
2012-01-01	47915133
2013-01-01	47397675
2014-01-01	47826134
2015-01-01	49213907
2016-01-01	47746408
2017-01-01	48645960