Year	Number
2004-01-01	162
2005-01-01	160
2006-01-01	154
2007-01-01	151
2008-01-01	146
2009-01-01	134
2010-01-01	129
2011-01-01	122
2012-01-01	112
2013-01-01	97
2014-01-01	94
2015-01-01	91
2016-01-01	88
2017-01-01	85