Year	Number
1996	49.7487449645996
1998	53
2000	55.2238807678223
2002	56.2189064025879
2003	56.7164192199707
2004	58.6538467407227
2005	59.3301429748535
2006	58.8516731262207
2007	61.2440185546875
2008	61.538459777832
2009	60.1895751953125
2010	60.6635055541992
2011	61.5023460388184
2012	61.0328636169434
2013	60.5633811950684
2014	67.3076934814453
2015	69.523811340332
2016	69.0476226806641
2017	73.3333358764648
2018	70
2019	71.9047622680664
2020	69.0476226806641
2021	70
2022	71.698112487793