Year	Number
1996	0.388550758361816
1998	0.401742517948151
2000	0.364934474229813
2002	0.301497399806976
2003	0.319293677806854
2004	0.206384032964706
2005	0.149592906236649
2006	-0.111628040671349
2007	-0.233249247074127
2008	-0.313582986593246
2009	-0.306065917015076
2010	-0.261244267225266
2011	-0.248732417821884
2012	-0.165085405111313
2013	-0.145987525582314
2014	-0.542809426784515
2015	-0.641648054122925
2016	-0.635412931442261
2017	-0.669915676116943
2018	-0.627337217330933
2019	-0.634144604206085
2020	-0.603375792503357
2021	-0.526224076747894
2022	-0.356178641319275