Year	Number
1996	0.187617555260658
1998	0.302315533161163
2000	0.331546425819397
2002	0.295856952667236
2003	0.361106097698212
2004	0.410197407007217
2005	0.30711555480957
2006	0.42075127363205
2007	0.337439477443695
2008	0.344973683357239
2009	0.273023992776871
2010	0.290558189153671
2011	0.282109946012497
2012	0.270857036113739
2013	0.259359508752823
2014	0.289130836725235
2015	0.287559330463409
2016	0.310822695493698
2017	0.286535561084747
2018	0.330506831407547
2019	0.328059256076813
2020	0.357047557830811
2021	0.362440079450607
2022	0.35089573264122