Year	Number
1996	-0.884026408195496
1998	-0.933607459068298
2000	-1.07503414154053
2002	-1.03007936477661
2003	-0.929536938667297
2004	-0.865046739578247
2005	-1.05196285247803
2006	-1.07976579666138
2007	-1.22670745849609
2008	-1.13178610801697
2009	-1.08494341373444
2010	-1.08740437030792
2011	-1.0535888671875
2012	-1.26853775978088
2013	-1.31764602661133
2014	-1.51759648323059
2015	-1.49353456497192
2016	-1.75277805328369
2017	-1.60513043403625
2018	-1.68523025512695
2019	-1.77413475513458
2020	-1.858802318573
2021	-1.74746489524841
2022	-1.75491416454315