Year	Number
1996	-1.27383208274841
1998	-1.1692898273468
2000	-1.23153555393219
2002	-1.03293061256409
2003	-1.46591007709503
2004	-1.80303514003754
2005	-1.68311214447021
2006	-1.72492063045502
2007	-1.73955118656158
2008	-1.8487343788147
2009	-1.70169413089752
2010	-1.72609734535217
2011	-1.71541202068329
2012	-1.59658908843994
2013	-1.58308362960815
2014	-1.6630871295929
2015	-1.64175271987915
2016	-1.69085609912872
2017	-1.70943439006805
2018	-1.78541624546051
2019	-1.72378432750702
2020	-1.68851840496063
2021	-1.79511249065399
2022	-1.79245460033417