Year	Number
1996	62.5
1998	57.7114410400391
2000	61.1940307617188
2002	56.2189064025879
2003	61.1940307617188
2004	59.6153831481934
2005	59.1346168518066
2006	58.1730766296387
2007	58.6538467407227
2008	58.1730766296387
2009	56.3981056213379
2010	58.2938385009766
2011	58.2159614562988
2012	57.2769966125488
2013	56.8075103759766
2014	59.1133003234863
2015	60.0985221862793
2016	63.5467987060547
2017	64.5320205688477
2018	66.019416809082
2019	65.2173919677734
2020	65.7004852294922
2021	65.2173919677734
2022	62.8019332885742