Year	Number
1996	-0.482703655958176
1998	-0.293480426073074
2000	-0.447519153356552
2002	-0.760921120643616
2003	-0.640948832035065
2004	-0.629703283309937
2005	-0.742618680000305
2006	-0.65560656785965
2007	-0.567137718200684
2008	-0.508774042129517
2009	-0.542492091655731
2010	-0.524832308292389
2011	-0.467423737049103
2012	-0.444079786539078
2013	-0.494722932577133
2014	-0.533904850482941
2015	-0.495386928319931
2016	-0.539625227451324
2017	-0.515828371047974
2018	-0.527298510074615
2019	-0.613412022590637
2020	-0.687793910503387
2021	-0.570348262786865
2022	-0.529057919979095