Year	Number
1996	0.340506970882416
1998	0.324012994766235
2000	0.346905559301376
2002	0.352838128805161
2003	0.326896071434021
2004	0.311714470386505
2005	0.284467488527298
2006	0.308843404054642
2007	0.306879043579102
2008	0.305525124073029
2009	0.253190785646439
2010	0.244963273406029
2011	0.246253311634064
2012	0.257312625646591
2013	0.260712444782257
2014	0.256511002779007
2015	0.250496745109558
2016	0.252729088068008
2017	0.241191178560257
2018	0.248153626918793
2019	0.242073029279709
2020	0.224344253540039
2021	0.263317197561264
2022	0.273801803588867