Year	Number
2004-01-01	177
2005-01-01	170
2006-01-01	168
2007-01-01	165
2008-01-01	162
2009-01-01	166
2010-01-01	159
2011-01-01	155
2012-01-01	149
2013-01-01	144
2014-01-01	143
2015-01-01	138
2016-01-01	138