Year	Number
1996	0.181661412119865
1998	0.260438412427902
2000	0.282076954841614
2002	0.259410440921783
2003	0.300158023834229
2004	0.311706155538559
2005	0.261893570423126
2006	0.226462677121162
2007	0.279594093561172
2008	0.28240430355072
2009	0.235823228955269
2010	0.239788204431534
2011	0.236383005976677
2012	0.231158822774887
2013	0.226006612181664
2014	0.259101390838623
2015	0.288758873939514
2016	0.27938386797905
2017	0.287052601575851
2018	0.290539056062698
2019	0.294821411371231
2020	0.317806571722031
2021	0.326989859342575
2022	0.327443838119507