Year	Number
1996	-1.16929292678833
1998	-1.10427415370941
2000	-1.15075349807739
2002	-0.823412001132965
2003	-0.651327192783356
2004	-0.76519763469696
2005	-0.785668969154358
2006	-0.825250744819641
2007	-0.800146639347076
2008	-0.734765291213989
2009	-0.705005824565887
2010	-0.703781366348267
2011	-0.652889311313629
2012	-0.695407688617706
2013	-0.731717467308044
2014	-0.712568700313568
2015	-0.721908211708069
2016	-0.693657755851746
2017	-0.754891455173492
2018	-0.827720761299133
2019	-0.840419888496399
2020	-0.661067366600037
2021	-0.643896758556366
2022	-0.639215767383575