Year	Number
1996	-1.27303266525269
1998	-1.25236058235168
2000	-1.2658679485321
2002	-1.1749712228775
2003	-1.14774608612061
2004	-1.31920981407166
2005	-1.17604744434357
2006	-1.04283225536346
2007	-1.04096925258636
2008	-1.18693053722382
2009	-1.22176921367645
2010	-1.297203540802
2011	-1.23177170753479
2012	-1.28034162521362
2013	-1.28733086585999
2014	-1.1320503950119
2015	-1.14801597595215
2016	-1.16322553157806
2017	-1.3479905128479
2018	-1.42829370498657
2019	-1.34555351734161
2020	-1.34479832649231
2021	-1.35408008098602
2022	-1.43415355682373