Year	Number
1996	0.613030731678009
1998	0.575733542442322
2000	0.595203697681427
2002	0.518141508102417
2003	0.349641561508179
2004	0.364736646413803
2005	0.384340941905975
2006	0.376439899206162
2007	0.348420560359955
2008	0.350017130374908
2009	0.293007612228394
2010	0.282069832086563
2011	0.310344904661179
2012	0.278807580471039
2013	0.293446391820908
2014	0.236860454082489
2015	0.24198617041111
2016	0.251646012067795
2017	0.268953740596771
2018	0.258186370134354
2019	0.250075668096542
2020	0.247393816709518
2021	0.248921230435371
2022	0.248592063784599