Year	Number
1996	-0.84262079000473
1998	-0.831447601318359
2000	-0.75189882516861
2002	-0.758069574832916
2003	-0.902238726615906
2004	-0.943994402885437
2005	-0.873771250247955
2006	-1.04960680007935
2007	-0.99727338552475
2008	-0.975757539272308
2009	-1.03230965137482
2010	-0.96742308139801
2011	-1.026531457901
2012	-1.00771832466125
2013	-1.03469169139862
2014	-0.899913251399994
2015	-0.755234062671661
2016	-0.707865595817566
2017	-0.73602831363678
2018	-0.749031722545624
2019	-0.747289180755615
2020	-0.731193363666534
2021	-0.69167947769165
2022	-0.64967155456543