Year	Number
2004	0.365187674760818
2005	0.287387371063232
2006	0.315462857484818
2007	0.32002717256546
2008	0.336053848266602
2009	0.350421518087387
2010	0.336508005857468
2011	0.339280128479004
2012	0.300836741924286
2013	0.308940380811691
2014	0.317990958690643
2015	0.228912457823753
2016	0.22597847878933
2017	0.234347388148308
2018	0.226347967982292
2019	0.228423789143562
2020	0.226407334208488
2021	0.240289986133575
2022	0.246608749032021