Year	Number
1996	0.406744420528412
1998	0.457408487796783
2000	0.455789715051651
2002	0.480342894792557
2003	0.400852143764496
2004	0.338822394609451
2005	0.357602417469025
2006	0.491848856210709
2007	0.511655807495117
2008	0.511172235012054
2009	0.259898394346237
2010	0.23939973115921
2011	0.234903126955032
2012	0.209522917866707
2013	0.203309610486031
2014	0.267149537801743
2015	0.276421308517456
2016	0.291436940431595
2017	0.282474011182785
2018	0.2483289539814
2019	0.267254561185837
2020	0.263182103633881
2021	0.25033700466156
2022	0.225406348705292