Year	Number
1996	0.0755526423454285
1998	-0.0388815775513649
2000	-0.214404493570328
2002	-0.761098086833954
2003	-0.777115821838379
2004	-0.767380177974701
2005	-0.557991087436676
2006	-0.57701563835144
2007	-0.60147225856781
2008	-0.699731647968292
2009	-0.694468080997467
2010	-0.59809422492981
2011	-0.563123285770416
2012	-0.623034238815308
2013	-0.656233191490173
2014	-0.866434514522552
2015	-0.748842358589172
2016	-0.320517688989639
2017	-0.238357037305832
2018	-0.219662562012672
2019	-0.427303701639175
2020	-0.487334787845612
2021	-0.476669818162918
2022	-0.48068231344223