Year	Number
1996	0.017489830031991
1998	-0.176737040281296
2000	0.253678381443024
2002	-0.0693416222929955
2003	0.0794467329978943
2004	-0.29839363694191
2005	0.0903691500425339
2006	-0.0349126979708672
2007	-0.131116077303886
2008	-0.171761319041252
2009	-0.151592925190926
2010	-0.319186180830002
2011	-0.542268931865692
2012	-0.544501006603241
2013	-0.748006761074066
2014	-0.52029275894165
2015	-0.587077856063843
2016	-0.394261837005615
2017	-0.638345539569855
2018	-0.55726546049118
2019	-0.411952257156372
2020	-0.303693801164627
2021	-0.186269342899323
2022	-0.027355907484889