Year	Number
1996	-0.670080244541168
1998	-0.848181307315826
2000	-0.675985157489777
2002	-0.695505380630493
2003	-0.673910856246948
2004	-0.666463196277618
2005	-0.671290218830109
2006	-0.523428201675415
2007	-0.724815309047699
2008	-0.787461042404175
2009	-0.844365835189819
2010	-0.820753991603851
2011	-0.867093980312347
2012	-0.59455281496048
2013	-0.663462817668915
2014	-0.397487729787827
2015	-0.553355574607849
2016	-0.608068525791168
2017	-0.513420879840851
2018	-0.459502160549164
2019	-0.334168434143066
2020	-0.410013139247894
2021	-0.438858985900879
2022	-0.496294170618057