Year	Number
1996	-1.00280439853668
1998	-0.893703401088715
2000	-0.713253438472748
2002	-0.669195592403412
2003	-0.730550408363342
2004	-0.744668662548065
2005	-0.84547358751297
2006	-0.840129256248474
2007	-0.780036866664886
2008	-0.723590731620789
2009	-0.660491347312927
2010	-0.676326990127563
2011	-0.589609205722809
2012	-0.456313699483871
2013	-0.543590784072876
2014	-0.575449883937836
2015	-0.752352297306061
2016	-0.749578177928925
2017	-0.69078004360199
2018	-0.741602540016174
2019	-0.821162223815918
2020	-0.857029616832733
2021	-0.885837376117706
2022	-0.899799406528473