Year	Number
1996	-0.308270066976547
1998	-0.064743272960186
2000	-0.452023267745972
2002	-0.72901463508606
2003	-0.723995983600616
2004	-0.699335694313049
2005	-0.777636587619781
2006	-1.09882938861847
2007	-1.13693797588348
2008	-1.12754857540131
2009	-1.25917947292328
2010	-1.12405169010162
2011	-0.956343531608582
2012	-0.943592429161072
2013	-0.837611019611359
2014	-0.920283794403076
2015	-1.14157736301422
2016	-0.958474397659302
2017	-1.02322399616241
2018	-0.886888802051544
2019	-0.796693980693817
2020	-0.871133387088776
2021	-0.719614744186401
2022	-0.45972153544426