Year	Number
1996	-1.78331053256989
1998	-1.87890470027924
2000	-1.43257737159729
2002	-1.63456511497498
2003	-1.75440907478333
2004	-1.35918843746185
2005	-0.913666009902954
2006	-1.1264134645462
2007	-1.15058553218842
2008	-1.09584629535675
2009	-1.19691348075867
2010	-1.25936758518219
2011	-1.36056065559387
2012	-1.32504332065582
2013	-1.20237147808075
2014	-1.19053518772125
2015	-1.09078657627106
2016	-1.09974193572998
2017	-0.919614136219025
2018	-0.842121779918671
2019	-1.05582988262177
2020	-0.847814321517944
2021	-0.992437243461609
2022	-0.741771519184113