Year	Number
1996	0.262547045946121
1998	0.263467073440552
2000	0.321114897727966
2002	0.154225796461105
2003	0.317870795726776
2004	0.148958027362823
2005	0.0242274515330791
2006	0.20851244032383
2007	0.158262476325035
2008	0.0998212322592735
2009	0.0596117079257965
2010	-0.0639763623476028
2011	-0.3537417948246
2012	-0.721316933631897
2013	-0.902563273906708
2014	-0.851661503314972
2015	-0.960177004337311
2016	-1.13972234725952
2017	-1.02349030971527
2018	-0.868218719959259
2019	-0.877072870731354
2020	-0.59433114528656
2021	-0.756551444530487
2022	-0.596295177936554