Year	Number
1996	-0.17433962225914
1998	-0.166477471590042
2000	-0.182534769177437
2002	-0.614730596542358
2003	-1.09949171543121
2004	-1.18346691131592
2005	-1.1744259595871
2006	-1.38557076454163
2007	-0.990260481834412
2008	-0.567302405834198
2009	-0.622969388961792
2010	-1.0396523475647
2011	-1.09803068637848
2012	-0.911251366138458
2013	-0.911773800849915
2014	-0.804615676403046
2015	-0.882429659366608
2016	-0.652019679546356
2017	-0.362933784723282
2018	-0.529558122158051
2019	-0.266192227602005
2020	-0.45618799328804
2021	-0.467156112194061
2022	-0.54657906293869