Year	Number
1996	0.387605756521225
1998	0.355241268873215
2000	0.355957746505737
2002	0.316182136535645
2003	0.342772305011749
2004	0.260854989290237
2005	0.266424268484116
2006	0.234210014343262
2007	0.230224192142487
2008	0.22661167383194
2009	0.232783541083336
2010	0.236173659563065
2011	0.231996029615402
2012	0.245355039834976
2013	0.238554775714874
2014	0.268441528081894
2015	0.252808153629303
2016	0.234031811356544
2017	0.24762786924839
2018	0.29508912563324
2019	0.215299054980278
2020	0.226966977119446
2021	0.24368542432785
2022	0.251888811588287