Year	Number
1996	66.331657409668
1998	65
2000	58.7064666748047
2002	57.7114410400391
2003	51.243782043457
2004	50
2005	44.9760780334473
2006	45.9330139160156
2007	46.8899536132813
2008	45.6730766296387
2009	41.7061614990234
2010	39.8104248046875
2011	41.3145523071289
2012	44.6009407043457
2013	44.6009407043457
2014	47.1153831481934
2015	44.761905670166
2016	39.523811340332
2017	39.0476188659668
2018	35.238094329834
2019	36.6666679382324
2020	31.9047622680664
2021	39.0476188659668
2022	39.6226425170898