Year	Number
1996	-1.44561946392059
1998	-1.28956842422485
2000	-1.29238271713257
2002	-1.1955019235611
2003	-1.04623198509216
2004	-1.1808317899704
2005	-1.05252146720886
2006	-1.09591245651245
2007	-1.12907373905182
2008	-1.15665423870087
2009	-1.19408190250397
2010	-1.24537324905396
2011	-1.1953147649765
2012	-1.14269411563873
2013	-0.970375061035156
2014	-1.02249026298523
2015	-0.952501654624939
2016	-0.852654457092285
2017	-0.906025290489197
2018	-0.852769494056702
2019	-0.849424362182617
2020	-1.07708406448364
2021	-0.847372114658356
2022	-1.04057228565216