Year	Number
1996	0.187617555260658
1998	0.302315533161163
2000	0.331546425819397
2002	0.295856952667236
2003	0.361106097698212
2004	0.376263976097107
2005	0.2796431183815
2006	0.355723708868027
2007	0.361441880464554
2008	0.357565850019455
2009	0.34416800737381
2010	0.345248699188232
2011	0.34813866019249
2012	0.337194293737412
2013	0.330278247594833
2014	0.371752977371216
2015	0.393420308828354
2016	0.385219007730484
2017	0.392407566308975
2018	0.388508200645447
2019	0.394042789936066
2020	0.433770954608917
2021	0.423158824443817
2022	0.415553271770477