Year	Number
1996	0.387605756521225
1998	0.355241268873215
2000	0.355957746505737
2002	0.316182136535645
2003	0.342772305011749
2004	0.380957245826721
2005	0.373064666986465
2006	0.257984191179276
2007	0.250154078006744
2008	0.245553061366081
2009	0.254924207925797
2010	0.262597858905792
2011	0.26203840970993
2012	0.286902904510498
2013	0.269732594490051
2014	0.268441528081894
2015	0.252808153629303
2016	0.234031811356544
2017	0.24762786924839
2018	0.29508912563324
2019	0.232172280550003
2020	0.239814266562462
2021	0.262917041778564
2022	0.279054999351501