Year	Number
1996	-0.295270144939423
1998	-0.230121165513992
2000	-0.157018542289734
2002	-0.137807384133339
2003	-0.361612886190414
2004	-0.329019099473953
2005	-0.456178694963455
2006	-0.396016359329224
2007	-0.313472509384155
2008	-0.229373604059219
2009	-0.14174522459507
2010	-0.208372116088867
2011	-0.205170571804047
2012	-0.139083847403526
2013	-0.197507470846176
2014	-0.340953946113586
2015	-0.424238204956055
2016	-0.44747668504715
2017	-0.480564415454865
2018	-0.40524896979332
2019	-0.42292308807373
2020	-0.482700347900391
2021	-0.480167269706726
2022	-0.468305677175522