Year	Number
1996	-1.55370151996613
1998	-1.08058178424835
2000	-0.481231272220612
2002	-0.634268760681152
2003	-0.6622274518013
2004	-0.796761572360992
2005	-0.868943333625793
2006	-0.623297810554504
2007	-0.760439932346344
2008	-0.735603809356689
2009	-0.848863244056702
2010	-0.777081429958344
2011	-0.713411033153534
2012	-0.700219869613647
2013	-0.693028211593628
2014	-0.587156057357788
2015	-0.37261375784874
2016	-0.31936252117157
2017	-0.339918076992035
2018	-0.424289911985397
2019	-0.434002041816711
2020	-0.581014394760132
2021	-0.637754738330841
2022	-0.59521096944809