Year	Number
1996	0.187617555260658
1998	0.302315533161163
2000	0.331546425819397
2002	0.295856952667236
2003	0.361106097698212
2004	0.376263976097107
2005	0.258499950170517
2006	0.299741894006729
2007	0.316639214754105
2008	0.305909484624863
2009	0.300981521606445
2010	0.288806110620499
2011	0.299673110246658
2012	0.299872100353241
2013	0.287499904632568
2014	0.3420130610466
2015	0.376609086990356
2016	0.368443340063095
2017	0.37619537115097
2018	0.372712045907974
2019	0.378692448139191
2020	0.398215413093567
2021	0.392812758684158
2022	0.386036068201065