Year	Number
1996	-0.827253401279449
1998	-1.46510195732117
2000	-1.43007302284241
2002	-0.913109719753265
2003	-0.827222049236298
2004	-0.964100897312164
2005	-1.07914042472839
2006	-1.20836925506592
2007	-1.23399722576141
2008	-1.15545642375946
2009	-1.10450148582458
2010	-1.06274175643921
2011	-1.10799777507782
2012	-1.15513336658478
2013	-1.1177796125412
2014	-1.10811972618103
2015	-1.01698756217957
2016	-1.16132199764252
2017	-1.12274765968323
2018	-1.19380259513855
2019	-1.2785792350769
2020	-1.27965807914734
2021	-1.23674309253693
2022	-1.19918370246887