Year	Number
1996	-1.06168437004089
1998	-0.52083957195282
2000	-0.987529456615448
2002	-0.969909846782684
2003	-1.16210162639618
2004	-1.0273996591568
2005	-0.975715458393097
2006	-0.841553807258606
2007	-0.774885892868042
2008	-0.892661690711975
2009	-1.1800479888916
2010	-0.999915421009064
2011	-0.760749697685242
2012	-0.907364726066589
2013	-0.805739760398865
2014	-0.550656914710999
2015	-0.398910075426102
2016	-0.207934841513634
2017	-0.263510197401047
2018	-0.276951968669891
2019	-0.1636593490839
2020	-0.35773891210556
2021	-0.355285465717316
2022	-0.446338385343552