Year	Number
1996	1.15766596794128
1998	1.15295279026031
2000	1.12659859657288
2002	1.10116672515869
2003	1.09160125255585
2004	0.960179805755615
2005	1.02187347412109
2006	0.579353213310242
2007	0.549499809741974
2008	0.593963444232941
2009	0.363491833209991
2010	0.323047578334808
2011	0.334075838327408
2012	0.397279173135757
2013	0.356671273708344
2014	0.360913723707199
2015	0.325167715549469
2016	0.356752157211304
2017	-0.133625239133835
2018	-0.193019330501556
2019	-0.200077146291733
2020	-0.297928124666214
2021	-0.300675302743912
2022	-0.482191681861877