Year	Number
1996	-1.6624231338501
1998	-1.6014848947525
2000	-1.15839385986328
2002	-0.764728426933289
2003	-1.22532165050507
2004	-1.31157219409943
2005	-1.61003684997559
2006	-1.59931635856628
2007	-1.76499831676483
2008	-1.75261247158051
2009	-1.72881937026978
2010	-1.75022375583649
2011	-1.80939316749573
2012	-1.6018477678299
2013	-1.60911595821381
2014	-1.73754167556763
2015	-1.64062190055847
2016	-1.67716920375824
2017	-1.67857372760773
2018	-1.71594655513763
2019	-1.75323903560638
2020	-1.64291417598724
2021	-1.81380772590637
2022	-1.68251287937164