Year	Number
1996	-1.40572607517242
1998	-1.3539137840271
2000	-1.57441258430481
2002	-1.74340748786926
2003	-1.26578211784363
2004	-1.16626405715942
2005	-1.54093611240387
2006	-1.7702112197876
2007	-1.87161386013031
2008	-1.99042999744415
2009	-2.04333114624023
2010	-1.97357547283173
2011	-1.93561995029449
2012	-1.95603215694427
2013	-1.77882349491119
2014	-1.98501086235046
2015	-2.1540961265564
2016	-1.97087836265564
2017	-1.65064537525177
2018	-1.80479407310486
2019	-1.88934803009033
2020	-2.01818037033081
2021	-1.83683395385742
2022	-1.81788623332977