Year	Number
1996	0.187617555260658
1998	0.302315533161163
2000	0.331546425819397
2002	0.295856952667236
2003	0.361106097698212
2004	0.262454003095627
2005	0.237393975257874
2006	0.318718701601028
2007	0.319038897752762
2008	0.331731259822845
2009	0.298496216535568
2010	0.304017275571823
2011	0.3041110932827
2012	0.259622365236282
2013	0.216831356287003
2014	0.23581375181675
2015	0.228933036327362
2016	0.247053250670433
2017	0.23433518409729
2018	0.244124665856361
2019	0.256479501724243
2020	0.284349679946899
2021	0.292211383581162
2022	0.289247930049896