Year	Number
1996	-0.743732213973999
1998	-0.998174607753754
2000	-0.971831321716309
2002	-0.971152007579803
2003	-1.00305140018463
2004	-1.08990585803986
2005	-0.896564424037933
2006	-0.789497017860413
2007	-0.793472647666931
2008	-0.797573387622833
2009	-1.0754017829895
2010	-1.19163048267365
2011	-1.2419102191925
2012	-1.25874841213226
2013	-1.25617694854736
2014	-1.56529819965363
2015	-1.50808072090149
2016	-1.695552110672
2017	-1.6177521944046
2018	-1.65836584568024
2019	-1.71263325214386
2020	-1.71141517162323
2021	-1.66823935508728
2022	-1.67955815792084