Year	Number
1996	-2.09033036231995
1998	-2.06287217140198
2000	-2.0802526473999
2002	-1.81154572963715
2003	-1.46310782432556
2004	-1.51154899597168
2005	-1.64344024658203
2006	-1.68946862220764
2007	-1.70887231826782
2008	-1.60716688632965
2009	-1.66450762748718
2010	-1.51652824878693
2011	-1.53632390499115
2012	-1.19257974624634
2013	-1.19309020042419
2014	-1.12413370609283
2015	-1.0188262462616
2016	-1.33969509601593
2017	-1.36976277828217
2018	-1.13820362091064
2019	-1.11377799510956
2020	-1.38916301727295
2021	-1.31168210506439
2022	-1.27180624008179