Year	Number
1996	-0.641581654548645
1998	-0.516356766223907
2000	-0.47222051024437
2002	-0.399259209632874
2003	-0.42732772231102
2004	-0.533582329750061
2005	-0.363443344831467
2006	-0.200293675065041
2007	-0.142469882965088
2008	-0.166212573647499
2009	-0.160290315747261
2010	-0.130868017673492
2011	-0.141483932733536
2012	-0.176013678312302
2013	-0.203786581754684
2014	-0.19340081512928
2015	-0.222010150551796
2016	-0.22302882373333
2017	-0.27815118432045
2018	-0.380436807870865
2019	-0.519345462322235
2020	-0.73454213142395
2021	-0.71796065568924
2022	-0.65902853012085