Year	Number
1996	21.1055278778076
1998	21.5
2000	15.9203977584839
2002	20.8955230712891
2003	16.9154224395752
2004	16.3461532592773
2005	25.3588523864746
2006	27.2727279663086
2007	23.4449768066406
2008	24.0384616851807
2009	18.0094795227051
2010	17.0616111755371
2011	18.7793426513672
2012	23.0046939849854
2013	22.0657272338867
2014	26.4423084259033
2015	16.1904754638672
2016	9.5238094329834
2017	10.4761905670166
2018	8.09523773193359
2019	9.0476188659668
2020	13.3333330154419
2021	15.2380952835083
2022	17.4528293609619