Year	Number
1996	0.0647299662232399
1998	0.155283033847809
2000	0.158748269081116
2002	0.124769225716591
2003	0.0347307622432709
2004	-0.0833611190319061
2005	-0.423394441604614
2006	-0.272532343864441
2007	-0.297004073858261
2008	-0.385201990604401
2009	-0.294943988323212
2010	-0.248191311955452
2011	-0.131351128220558
2012	-0.125741094350815
2013	-0.166235014796257
2014	-0.108953259885311
2015	-0.0587588995695114
2016	-0.123026698827744
2017	-0.162157982587814
2018	-0.217681854963303
2019	-0.232445597648621
2020	-0.225914791226387
2021	-0.389435440301895
2022	-0.65364283323288