Year	Number
1996	0.388865143060684
1998	0.360765397548676
2000	0.309702605009079
2002	0.355229288339615
2003	0.335184574127197
2004	0.316238701343536
2005	0.276335954666138
2006	0.291350603103638
2007	0.285714030265808
2008	0.252095013856888
2009	0.257173120975494
2010	0.248675495386124
2011	0.256089091300964
2012	0.257209658622742
2013	0.253756314516068
2014	0.328017204999924
2015	0.26445659995079
2016	0.263630747795105
2017	0.254813969135284
2018	0.267879158258438
2019	0.267544656991959
2020	0.287431299686432
2021	0.290921449661255
2022	0.277303248643875