Year	Number
2004-01-01	11669031
2005-01-01	12133449
2006-01-01	12323313
2007-01-01	13845003
2008-01-01	14902224
2009-01-01	15577708
2010-01-01	16296089
2011-01-01	17302416
2012-01-01	18157258
2013-01-01	19554721
2014-01-01	21101164
2015-01-01	14358100
2016-01-01	14623167
2017-01-01	15010597