Year	Number
1996	-0.443439602851868
1998	-0.236152812838554
2000	-0.339138120412827
2002	-0.489535063505173
2003	-0.470480889081955
2004	-0.34608057141304
2005	-0.44530525803566
2006	-0.426474213600159
2007	-0.45082300901413
2008	-0.421554148197174
2009	-0.435356438159943
2010	-0.302378356456757
2011	-0.353553354740143
2012	-0.310052245855331
2013	-0.308052003383636
2014	-0.408892065286636
2015	-0.419965863227844
2016	-0.528951227664948
2017	-0.696680545806885
2018	-0.731356859207153
2019	-0.714432656764984
2020	-0.679826021194458
2021	-0.852285444736481
2022	-0.91473376750946