Year	Number
1996	-1.04381000995636
1998	-1.6188086271286
2000	-1.34849834442139
2002	-1.29098534584045
2003	-1.26797068119049
2004	-1.19025015830994
2005	-1.47120356559753
2006	-1.26634573936462
2007	-1.22322463989258
2008	-1.19344258308411
2009	-1.22013962268829
2010	-1.21804785728455
2011	-1.20752120018005
2012	-1.14205086231232
2013	-1.12112390995026
2014	-1.1192764043808
2015	-1.13644921779633
2016	-1.14962911605835
2017	-1.16136419773102
2018	-1.13426172733307
2019	-1.11040508747101
2020	-1.12040197849274
2021	-1.09848213195801
2022	-1.08952295780182