Year	Number
1996	-0.998445451259613
1998	-1.17352044582367
2000	-1.05684018135071
2002	-0.698373138904572
2003	-0.724401772022247
2004	-0.79287451505661
2005	-0.719699025154114
2006	-0.760136187076569
2007	-0.760422825813293
2008	-0.785017490386963
2009	-0.797493636608124
2010	-0.847448468208313
2011	-0.796498656272888
2012	-0.983055293560028
2013	-0.899003386497498
2014	-1.08405673503876
2015	-0.959288060665131
2016	-1.0265303850174
2017	-0.964599192142487
2018	-1.02598321437836
2019	-1.09925186634064
2020	-1.18722105026245
2021	-1.25199282169342
2022	-1.19682347774506