Year	Number
1996	22.8723411560059
1998	25.5319156646729
2000	27.5132274627686
2002	21.6931209564209
2003	20.1005020141602
2004	16.019416809082
2005	19.4174766540527
2006	18.3574886322021
2007	13.043478012085
2008	9.13461494445801
2009	4.26540279388428
2010	3.79146909713745
2011	2.36966824531555
2012	2.84360194206238
2013	4.26540279388428
2014	4.2857141494751
2015	2.38095235824585
2016	1.42857146263123
2017	0.952380955219269
2018	0.943396210670471
2019	2.8301887512207
2020	2.35849046707153
2021	3.30188679695129
2022	4.24528312683105