Year	Number
1996	0.181661412119865
1998	0.260438412427902
2000	0.282076954841614
2002	0.259410440921783
2003	0.300158023834229
2004	0.330194413661957
2005	0.268858820199966
2006	0.346091717481613
2007	0.346957564353943
2008	0.353408962488174
2009	0.278606116771698
2010	0.272578209638596
2011	0.268234819173813
2012	0.266534626483917
2013	0.266643017530441
2014	0.300576001405716
2015	0.288758873939514
2016	0.27938386797905
2017	0.287052601575851
2018	0.290539056062698
2019	0.294821411371231
2020	0.317806571722031
2021	0.326989859342575
2022	0.327443838119507