Year	Number
2004-01-01	70
2005-01-01	85
2006-01-01	94
2007-01-01	96
2008-01-01	94
2009-01-01	96
2010-01-01	101
2011-01-01	125
2012-01-01	133
2013-01-01	148
2014-01-01	157
2015-01-01	157