Year	Number
1996	-0.9293492436409
1998	-0.885578393936157
2000	-0.998041212558746
2002	-0.879591941833496
2003	-0.936451733112335
2004	-0.850290715694427
2005	-0.771100759506226
2006	-0.98868316411972
2007	-0.928942918777466
2008	-0.971363067626953
2009	-0.895501971244812
2010	-0.875314056873322
2011	-0.905360877513886
2012	-1.1464250087738
2013	-1.17282497882843
2014	-0.942938148975372
2015	-0.94206964969635
2016	-1.13657522201538
2017	-1.06272661685944
2018	-1.05718719959259
2019	-1.04142189025879
2020	-1.01011025905609
2021	-1.08720982074738
2022	-1.01709938049316