Year	Number
1996	-0.128497436642647
1998	0.0239137783646584
2000	0.0260655991733074
2002	-0.207287535071373
2003	-0.14708548784256
2004	-0.167148128151894
2005	-0.118025802075863
2006	-0.162207126617432
2007	-0.228115558624268
2008	-0.323701977729797
2009	-0.392095685005188
2010	-0.143460005521774
2011	-0.142604574561119
2012	-0.24008908867836
2013	-0.3071448802948
2014	-0.255771666765213
2015	-0.401139050722122
2016	-0.482714980840683
2017	-0.460668236017227
2018	-0.673814237117767
2019	-0.809006750583649
2020	-1.20486307144165
2021	-1.31169736385345
2022	-1.45865571498871