Year	Number
1996	64.5
1998	63.1840782165527
2000	61.1940307617188
2002	60.6965179443359
2003	62.1890563964844
2004	62.980770111084
2005	62.019229888916
2006	59.6153831481934
2007	58.1730766296387
2008	58.1730766296387
2009	58.2938385009766
2010	58.7677726745605
2011	59.6244125366211
2012	61.5023460388184
2013	61.0328636169434
2014	60.5911331176758
2015	61.0837440490723
2016	62.0689659118652
2017	60.5911331176758
2018	60.1941757202148
2019	59.9033813476563
2020	60.8695640563965
2021	63.2850227355957
2022	61.3526573181152