Year	Number
1996	0.340506970882416
1998	0.324012994766235
2000	0.346905559301376
2002	0.352838128805161
2003	0.326896071434021
2004	0.311714470386505
2005	0.247057661414146
2006	0.265259623527527
2007	0.26677930355072
2008	0.259912461042404
2009	0.270679831504822
2010	0.2547567486763
2011	0.255219489336014
2012	0.252710998058319
2013	0.252275258302689
2014	0.273099511861801
2015	0.265162706375122
2016	0.267255902290344
2017	0.269206166267395
2018	0.256623446941376
2019	0.261914074420929
2020	0.248517796397209
2021	0.27375653386116
2022	0.282890319824219