Year	Number
1996	-0.993923425674438
1998	-1.05879712104797
2000	-1.00747871398926
2002	-1.06477046012878
2003	-1.03281939029694
2004	-1.0977121591568
2005	-1.26726925373077
2006	-1.32556045055389
2007	-1.32909786701202
2008	-1.23223948478699
2009	-1.31282722949982
2010	-1.17509734630585
2011	-1.23196542263031
2012	-1.15086257457733
2013	-1.16199910640717
2014	-1.12937223911285
2015	-1.17861187458038
2016	-1.1043074131012
2017	-1.07847428321838
2018	-0.960398018360138
2019	-0.959891974925995
2020	-1.12446999549866
2021	-1.14971888065338
2022	-1.23002862930298