Year	Number
1996	-0.819772601127625
1998	-0.77269583940506
2000	-1.31242227554321
2002	-1.45189714431763
2003	-1.45855021476746
2004	-1.59736406803131
2005	-1.76681733131409
2006	-1.75380945205688
2007	-1.70445394515991
2008	-1.59331786632538
2009	-1.54764413833618
2010	-1.55507206916809
2011	-1.66020834445953
2012	-1.56718134880066
2013	-1.54442870616913
2014	-1.44286942481995
2015	-1.46507394313812
2016	-1.3393886089325
2017	-1.35598385334015
2018	-1.363152384758
2019	-1.40739941596985
2020	-1.45349812507629
2021	-1.58077239990234
2022	-1.6263952255249