Year	Number
1996	0.187617555260658
1998	0.302315533161163
2000	0.331546425819397
2002	0.295856952667236
2003	0.361106097698212
2004	0.410197407007217
2005	0.265190988779068
2006	0.31173050403595
2007	0.326607048511505
2008	0.326600551605225
2009	0.300981521606445
2010	0.288806110620499
2011	0.299673110246658
2012	0.299872100353241
2013	0.293751776218414
2014	0.353842169046402
2015	0.390668779611588
2016	0.384507298469543
2017	0.392347872257233
2018	0.385205060243607
2019	0.391434550285339
2020	0.427005618810654
2021	0.422974407672882
2022	0.400206208229065