Year	Number
1996	-1.3873907327652
1998	-1.42518937587738
2000	-1.45503640174866
2002	-1.7139093875885
2003	-1.73716354370117
2004	-1.72932910919189
2005	-1.66308867931366
2006	-1.41297435760498
2007	-1.34994995594025
2008	-1.285773396492
2009	-1.33430373668671
2010	-1.38317584991455
2011	-1.418013215065
2012	-1.33210027217865
2013	-1.30045402050018
2014	-1.18039405345917
2015	-1.19614708423615
2016	-1.01366877555847
2017	-1.09687674045563
2018	-1.06164228916168
2019	-0.975454747676849
2020	-1.03267776966095
2021	-1.2622035741806
2022	-1.37736070156097