Year	Number
1996	1.27418982982635
1998	1.1116589307785
2000	0.972350239753723
2002	1.15235102176666
2003	1.1067943572998
2004	1.04428017139435
2005	1.05113351345062
2006	0.867630779743195
2007	0.894493699073792
2008	1.0773845911026
2009	1.15220522880554
2010	0.981475114822388
2011	0.921245932579041
2012	1.00191485881805
2013	1.19474101066589
2014	0.98403799533844
2015	1.15872240066528
2016	1.14920330047607
2017	1.29399514198303
2018	1.18123805522919
2019	1.1342910528183
2020	0.979880332946777
2021	0.953686892986298
2022	1.00159108638763