Year	Number
1996	0.990575969219208
1998	1.00561439990997
2000	0.944821059703827
2002	0.946030616760254
2003	1.11526930332184
2004	1.07239961624146
2005	1.0653692483902
2006	1.06539523601532
2007	1.05695688724518
2008	1.08235323429108
2009	1.08709967136383
2010	1.06660449504852
2011	1.09516870975494
2012	1.09553349018097
2013	1.05532383918762
2014	0.807420372962952
2015	0.546864092350006
2016	0.507921814918518
2017	0.50852769613266
2018	0.479215204715729
2019	0.471858948469162
2020	0.535820066928864
2021	0.488589078187943
2022	0.618146777153015