Year	Number
2004-01-01	153.2819
2005-01-01	156.3707
2006-01-01	157.1429
2007-01-01	160.6178
2008-01-01	166.0232
2009-01-01	169.1120
2010-01-01	170.2703
2011-01-01	175.2896
2012-01-01	171.0425
2013-01-01	170.6564
2014-01-01	188.4170
2015-01-01	199.2278
2016-01-01	208.1081
2017-01-01	223.1660