Year	Number
1996	-1.12837553024292
1998	-1.06922900676727
2000	-1.07876443862915
2002	-0.924903035163879
2003	-1.00848138332367
2004	-0.931252717971802
2005	-0.936883449554443
2006	-0.877598881721497
2007	-0.746833682060242
2008	-0.761386632919312
2009	-0.81895786523819
2010	-0.862070262432098
2011	-0.682568550109863
2012	-0.509467363357544
2013	-0.519751310348511
2014	-0.533403754234314
2015	-0.642433404922485
2016	-0.737051844596863
2017	-0.700921833515167
2018	-0.653432190418243
2019	-0.741947412490845
2020	-0.824801385402679
2021	-0.841101825237274
2022	-0.658232748508453