Year	Number
1996	-0.938624918460846
1998	-1.06361532211304
2000	-1.06040692329407
2002	-1.09704899787903
2003	-1.06000566482544
2004	-0.974191248416901
2005	-1.03406727313995
2006	-1.02389752864838
2007	-1.04956614971161
2008	-1.06779563426971
2009	-1.04035580158234
2010	-1.058274269104
2011	-1.03312134742737
2012	-1.02158093452454
2013	-1.03689646720886
2014	-0.944473266601563
2015	-0.954277455806732
2016	-1.03098773956299
2017	-1.05175507068634
2018	-1.12902331352234
2019	-1.2116025686264
2020	-1.20735490322113
2021	-1.16166627407074
2022	-1.14824461936951