Year	Number
1996	1.02667045593262
1998	1.00952386856079
2000	0.987186789512634
2002	0.939704358577728
2003	0.926884114742279
2004	0.750615060329437
2005	0.801017343997955
2006	0.905649721622467
2007	0.719497740268707
2008	0.484056323766708
2009	0.49756196141243
2010	0.347569495439529
2011	0.231762483716011
2012	0.298656761646271
2013	0.28756046295166
2014	0.282481491565704
2015	0.240542605519295
2016	0.178615316748619
2017	0.146652981638908
2018	0.125301271677017
2019	0.151736706495285
2020	0.268519282341003
2021	0.289970070123672
2022	0.341509431600571