Year	Number
1996	-0.56990909576416
1998	-0.335518449544907
2000	-0.374595284461975
2002	-0.444421142339706
2003	-0.467406183481216
2004	-0.572165548801422
2005	-0.591363310813904
2006	-0.742222785949707
2007	-0.759377896785736
2008	-0.857629656791687
2009	-0.876420259475708
2010	-0.847521543502808
2011	-0.690779805183411
2012	-0.570491433143616
2013	-0.588030815124512
2014	-0.562072694301605
2015	-0.536284148693085
2016	-0.579242348670959
2017	-0.560794770717621
2018	-0.130894392728806
2019	0.0547256655991077
2020	0.0471597090363503
2021	0.0540730990469456
2022	0.0882339403033257