Year	Number
1996	68.3417053222656
1998	64.5
2000	67.6616897583008
2002	67.164176940918
2003	65.6716384887695
2004	68.2692337036133
2005	68.4210510253906
2006	69.3779907226563
2007	70.8134002685547
2008	70.1923065185547
2009	65.4028472900391
2010	65.8767776489258
2011	66.1971817016602
2012	63.8497657775879
2013	62.9107971191406
2014	65.8653869628906
2015	60.476188659668
2016	58.0952377319336
2017	60.9523811340332
2018	61.9047622680664
2019	60
2020	59.523811340332
2021	58.0952377319336
2022	56.6037750244141