Year	Number
1996	-0.380564451217651
1998	-0.546766698360443
2000	-0.721570193767548
2002	-1.04380238056183
2003	-1.05236744880676
2004	-1.20957052707672
2005	-1.13566422462463
2006	-1.2037011384964
2007	-1.16012692451477
2008	-1.16596508026123
2009	-1.20978689193726
2010	-1.18977093696594
2011	-1.19257616996765
2012	-0.972218334674835
2013	-0.961324989795685
2014	-0.489301294088364
2015	-0.489001840353012
2016	-0.513335704803467
2017	-0.357484430074692
2018	-0.297697931528091
2019	-0.174313709139824
2020	-0.82950896024704
2021	-0.804550170898438
2022	-0.851105093955994