Year	Number
1996	-1.77829897403717
1998	-1.48284018039703
2000	-1.90411269664764
2002	-0.777628898620605
2003	-0.833158433437347
2004	-1.01044058799744
2005	-1.15223681926727
2006	-1.42155075073242
2007	-1.75128364562988
2008	-1.79859554767609
2009	-1.34090304374695
2010	-0.94294685125351
2011	-0.724771440029144
2012	-0.717079222202301
2013	-0.612895429134369
2014	-0.330464035272598
2015	0.0831826627254486
2016	-0.0113400500267744
2017	-0.0754485204815865
2018	-0.139389723539352
2019	-0.21556980907917
2020	-0.0891569182276726
2021	-0.376803755760193
2022	-0.785569846630096