Year	Number
1996	-0.723757088184357
1998	-0.989971041679382
2000	-1.02819049358368
2002	-1.02573943138123
2003	-0.948509097099304
2004	-0.811878681182861
2005	-0.833648562431335
2006	-0.787619292736053
2007	-0.825754582881927
2008	-0.840163767337799
2009	-0.909787476062775
2010	-0.923493564128876
2011	-0.936401605606079
2012	-1.00157511234283
2013	-1.05594646930695
2014	-1.09737718105316
2015	-1.08107650279999
2016	-1.08622479438782
2017	-1.06967091560364
2018	-1.05088365077972
2019	-1.17657923698425
2020	-1.06807589530945
2021	-1.03053748607635
2022	-1.04179608821869