Year	Number
1996	1.39611268043518
1998	1.06650125980377
2000	1.33396470546722
2002	1.18941462039948
2003	0.878117203712463
2004	0.935463547706604
2005	0.8917076587677
2006	0.934466600418091
2007	0.928874909877777
2008	0.954700112342834
2009	0.855120599269867
2010	0.888859868049622
2011	0.935710072517395
2012	0.997997224330902
2013	1.03107297420502
2014	1.03219199180603
2015	0.873180687427521
2016	1.0334244966507
2017	0.876146674156189
2018	0.97081196308136
2019	0.917313098907471
2020	0.861676931381226
2021	0.835315883159637
2022	0.933572053909302