Year	Number
1996	-1.08749449253082
1998	-1.34771287441254
2000	-1.23829925060272
2002	-1.44881856441498
2003	-1.47438275814056
2004	-1.33793187141418
2005	-1.40304481983185
2006	-1.53845131397247
2007	-1.52694940567017
2008	-1.49671363830566
2009	-1.4826385974884
2010	-1.49696779251099
2011	-1.45916306972504
2012	-1.42006897926331
2013	-1.36639952659607
2014	-1.37471222877502
2015	-1.35886025428772
2016	-1.37337625026703
2017	-1.41567492485046
2018	-1.47134065628052
2019	-1.40533208847046
2020	-1.37745916843414
2021	-1.30968391895294
2022	-1.28870344161987