Year	Number
1996	7.03517580032349
1998	8.5
2000	13.9303483963013
2002	10.945273399353
2003	16.9154224395752
2004	19.7115383148193
2005	25.3588523864746
2006	30.1435413360596
2007	31.1004791259766
2008	35.0961532592773
2009	41.7061614990234
2010	41.2322273254395
2011	33.3333320617676
2012	31.9248828887939
2013	27.2300472259521
2014	24.0384616851807
2015	23.8095245361328
2016	25.238094329834
2017	28.5714282989502
2018	25.7142848968506
2019	24.761905670166
2020	26.1904754638672
2021	24.761905670166
2022	21.698112487793