Year	Number
1996	-0.44970777630806
1998	-0.539550304412842
2000	-0.666360259056091
2002	-0.756515443325043
2003	-0.780572593212128
2004	-0.764899849891663
2005	-0.821377992630005
2006	-1.03100264072418
2007	-1.03286147117615
2008	-1.10530638694763
2009	-1.20504021644592
2010	-1.14322912693024
2011	-1.14428532123566
2012	-1.06392514705658
2013	-0.870148360729218
2014	-0.970510959625244
2015	-0.956348419189453
2016	-0.648918271064758
2017	-0.718148052692413
2018	-0.663210570812225
2019	-0.542889177799225
2020	-0.541196286678314
2021	-0.353610903024673
2022	-0.620224118232727