Year	Number
1996	0.179107308387756
1998	0.24693064391613
2000	0.266331732273102
2002	0.234331488609314
2003	0.253106504678726
2004	0.262454003095627
2005	0.237393975257874
2006	0.318718701601028
2007	0.329242497682571
2008	0.331731259822845
2009	0.323029518127441
2010	0.304017275571823
2011	0.3041110932827
2012	0.290130853652954
2013	0.235853806138039
2014	0.287785947322845
2015	0.263141095638275
2016	0.264725565910339
2017	0.28424671292305
2018	0.259235680103302
2019	0.264851450920105
2020	0.271182328462601
2021	0.269787937402725
2022	0.266981363296509