Year	Number
1996	-0.859939992427826
1998	-1.05510711669922
2000	-1.07503414154053
2002	-1.13215708732605
2003	-1.12422430515289
2004	-1.32887244224548
2005	-1.1102192401886
2006	-1.38104915618896
2007	-1.20500719547272
2008	-1.06138837337494
2009	-0.945070207118988
2010	-1.13826775550842
2011	-1.19323122501373
2012	-0.988945424556732
2013	-1.24267661571503
2014	-1.05590403079987
2015	-0.928497076034546
2016	-0.971013605594635
2017	-0.951664865016937
2018	-1.00511503219604
2019	-1.12856233119965
2020	-1.25839388370514
2021	-1.12807631492615
2022	-1.04042935371399