Year	Number
1996	-1.0479496717453
1998	-0.992841362953186
2000	-1.0572007894516
2002	-1.25275146961212
2003	-1.38021075725555
2004	-1.25965797901154
2005	-1.1734801530838
2006	-1.01482832431793
2007	-0.956503331661224
2008	-0.874180316925049
2009	-1.04979801177979
2010	-0.974354088306427
2011	-1.00235879421234
2012	-0.856835246086121
2013	-0.803554475307465
2014	-0.756003856658936
2015	-0.819004893302917
2016	-0.811310946941376
2017	-0.904718279838562
2018	-0.863172948360443
2019	-0.968699157238007
2020	-0.880950748920441
2021	-0.663793444633484
2022	-0.805023312568665