Year	Number
1996	-1.15118622779846
1998	-1.12271451950073
2000	-1.04199123382568
2002	-1.46213829517365
2003	-1.51878440380096
2004	-1.32268130779266
2005	-1.24752271175385
2006	-1.2592887878418
2007	-1.25203287601471
2008	-1.32310199737549
2009	-1.62521064281464
2010	-1.34115171432495
2011	-1.20131802558899
2012	-1.07890439033508
2013	-1.10128474235535
2014	-1.03973531723022
2015	-1.09781730175018
2016	-0.799367249011993
2017	-0.894905567169189
2018	-0.918106615543365
2019	-0.815560400485992
2020	-0.88781064748764
2021	-1.1222825050354
2022	-1.285315990448