Year	Number
1996	-0.526031970977783
1998	-0.0207697190344334
2000	0.0497975237667561
2002	-0.414172112941742
2003	-0.640924513339996
2004	-0.822401702404022
2005	-0.629358649253845
2006	-0.837807655334473
2007	-0.552382111549377
2008	-0.510431706905365
2009	-0.607227087020874
2010	-0.898418307304382
2011	-1.43705701828003
2012	-1.43632972240448
2013	-1.63883090019226
2014	-1.63117659091949
2015	-1.49933218955994
2016	-1.43972682952881
2017	-1.42964518070221
2018	-1.18810069561005
2019	-1.12460207939148
2020	-1.18191170692444
2021	-1.03284096717834
2022	-1.02805662155151