Year	Number
1996	-1.05690824985504
1998	-0.588243722915649
2000	-1.45532631874084
2002	-1.62632930278778
2003	-1.63558828830719
2004	-1.75441575050354
2005	-1.6665004491806
2006	-2.03407764434814
2007	-2.01405644416809
2008	-1.86071193218231
2009	-1.99455380439758
2010	-2.21112322807312
2011	-1.95645451545715
2012	-2.04207372665405
2013	-2.08847832679749
2014	-2.1302764415741
2015	-1.92170512676239
2016	-1.87388896942139
2017	-1.99671685695648
2018	-2.09741425514221
2019	-1.93307113647461
2020	-1.89196145534515
2021	-1.78729927539825
2022	-1.79814147949219