Year	Number
1996	0.901226282119751
1998	0.661800384521484
2000	0.345016211271286
2002	0.03129792958498
2003	0.0605971701443195
2004	-0.0189415775239468
2005	0.0196533296257257
2006	-0.125168323516846
2007	-0.0488396696746349
2008	-0.0788561478257179
2009	-0.0540622100234032
2010	-0.208101376891136
2011	-0.135050490498543
2012	-0.182379499077797
2013	-0.252770155668259
2014	-0.46440914273262
2015	-0.365086168050766
2016	-0.303454995155334
2017	-0.393393129110336
2018	-0.37933874130249
2019	-0.256702780723572
2020	-0.160587027668953
2021	-0.299970984458923
2022	-0.37968635559082