Year	Number
2004	0.393849045038223
2005	0.340958386659622
2006	0.418964713811874
2007	0.415193498134613
2008	0.4012451171875
2009	0.426269233226776
2010	0.430662959814072
2011	0.418170005083084
2012	0.433321326971054
2013	0.442143976688385
2014	0.42502698302269
2015	0.420161634683609
2016	0.419990062713623
2017	0.399292975664139
2018	0.400607585906982
2019	0.407291561365128
2020	0.378925621509552
2021	0.428422212600708
2022	0.463415056467056