Year	Number
1996	50.5
1998	50.2487564086914
2000	57.2139320373535
2002	58.7064666748047
2003	60.6965179443359
2004	58.6538467407227
2005	57.6923065185547
2006	51.9230766296387
2007	52.4038467407227
2008	51.9230766296387
2009	55.4502372741699
2010	54.9763031005859
2011	53.051643371582
2012	53.9906120300293
2013	53.051643371582
2014	48.7684745788574
2015	44.3349761962891
2016	43.8423652648926
2017	42.8571434020996
2018	45.6310691833496
2019	45.8937187194824
2020	44.9275360107422
2021	43.961353302002
2022	42.0289840698242