Year	Number
1996	-1.1677018404007
1998	-1.1804506778717
2000	-1.197514295578
2002	-1.15549266338348
2003	-1.33546328544617
2004	-1.37756884098053
2005	-1.32318198680878
2006	-1.24103772640228
2007	-1.30749356746674
2008	-1.30876457691193
2009	-1.39776611328125
2010	-1.33247494697571
2011	-1.36746907234192
2012	-1.30240142345428
2013	-1.33687472343445
2014	-1.45779824256897
2015	-1.42732346057892
2016	-1.48333728313446
2017	-1.44433307647705
2018	-1.19925093650818
2019	-1.05841791629791
2020	-0.938672542572021
2021	-0.651610195636749
2022	-0.601941287517548