Year	Number
1996	-1.14967966079712
1998	-1.10067796707153
2000	-1.15839385986328
2002	-1.03128480911255
2003	-1.22532165050507
2004	-0.791229426860809
2005	-1.06214475631714
2006	-0.981712877750397
2007	-1.10659205913544
2008	-1.27346467971802
2009	-0.675307810306549
2010	-0.373725682497025
2011	-0.598154127597809
2012	-0.712200820446014
2013	-0.725357711315155
2014	-0.487824648618698
2015	-0.507560253143311
2016	-0.668445944786072
2017	-0.435080349445343
2018	-0.791828453540802
2019	-0.775189697742462
2020	-0.676648795604706
2021	-0.795561015605927
2022	-0.900952577590942