Year	Number
1996	0.286023378372192
1998	0.389990568161011
2000	0.469307065010071
2002	0.386146128177643
2003	0.29921892285347
2004	0.367766201496124
2005	0.408908843994141
2006	0.51797342300415
2007	0.498997658491135
2008	0.514151155948639
2009	0.464297264814377
2010	0.432130426168442
2011	0.376137167215347
2012	0.318529605865479
2013	0.311523497104645
2014	0.428146094083786
2015	0.486150950193405
2016	0.540918290615082
2017	0.598600208759308
2018	0.533273637294769
2019	0.51515406370163
2020	0.585220873355865
2021	0.59418797492981
2022	0.563367962837219