Year	Number
1996	0.613030731678009
1998	0.575733542442322
2000	0.595203697681427
2002	0.518141508102417
2003	0.349641561508179
2004	0.330648332834244
2005	0.332869827747345
2006	0.331756144762039
2007	0.308105289936066
2008	0.309818059206009
2009	0.323601871728897
2010	0.320087254047394
2011	0.306695103645325
2012	0.282746523618698
2013	0.297252923250198
2014	0.238057717680931
2015	0.242593795061111
2016	0.245254904031754
2017	0.254438191652298
2018	0.249047264456749
2019	0.271763026714325
2020	0.270491451025009
2021	0.273985654115677
2022	0.267183810472488