Year	Number
1996	-1.56857550144196
1998	-1.56888091564178
2000	0.274133086204529
2002	-0.83753502368927
2003	-0.429828256368637
2004	-0.59241133928299
2005	-0.509093940258026
2006	-1.11040985584259
2007	-1.20347332954407
2008	-1.05070447921753
2009	-1.20296549797058
2010	-1.18515872955322
2011	-1.1867653131485
2012	-1.14376664161682
2013	-1.2126704454422
2014	-1.11254811286926
2015	-1.13323724269867
2016	-1.17557942867279
2017	-1.17624771595001
2018	-1.13863778114319
2019	-1.12843763828278
2020	-1.19682133197784
2021	-1.02632677555084
2022	-0.883395969867706