Year	Number
1993	64.5148275166
1994	60.1775267299
1995	51.0591083317
1996	45.9350413557
1997	37.3209602582
1998	40.2259431108
1999	39.6610853339
2000	37.7446035909
2001	34.8194472463
2002	34.9404881985
2003	39.8628202542
2004	50.4942505548
2005	55.9007464192
2006	57.030461973
2007	60.7625579988
2008	57.9584426064
2009	49.7074843655
2010	42.8888440589
2011	49.1829735727
2012	59.3302400646
2013	59.612668953
2014	57.69618721
2015	66.007665927
2016	64.1920516441
2017	57.7970546702
2018	54.7508573734
2019	57.7970546702
2020	57.0909824491