Year	Number
1996	8.5427131652832
1998	9.5
2000	9.95024871826172
2002	6.96517419815063
2003	11.9402980804443
2004	13.942307472229
2005	12.4401912689209
2006	16.7464122772217
2007	16.2679424285889
2008	19.230770111084
2009	18.4834117889404
2010	18.4834117889404
2011	22.5352115631104
2012	22.0657272338867
2013	21.5962448120117
2014	17.3076915740967
2015	18.5714282989502
2016	22.380952835083
2017	22.380952835083
2018	22.380952835083
2019	22.380952835083
2020	22.8571434020996
2021	21.9047622680664
2022	23.1132068634033