Year	Number
1996	-1.15884947776794
1998	-1.1658126115799
2000	-1.14436364173889
2002	-1.00375056266785
2003	-0.96461683511734
2004	-0.897880256175995
2005	-1.0125367641449
2006	-0.935450911521912
2007	-0.978594720363617
2008	-1.06836628913879
2009	-1.0707300901413
2010	-0.911055028438568
2011	-0.96374249458313
2012	-1.09887766838074
2013	-1.03594160079956
2014	-0.938904762268066
2015	-1.03067374229431
2016	-0.913663983345032
2017	-0.975330948829651
2018	-0.862696051597595
2019	-0.807418882846832
2020	-0.876583576202393
2021	-0.735883414745331
2022	-0.759701311588287