Year	Number
1996	0.539628803730011
1998	0.509335398674011
2000	0.57901805639267
2002	0.386922985315323
2003	0.153711155056953
2004	0.06238729134202
2005	-0.00755707500502467
2006	-0.0693550705909729
2007	-0.137440487742424
2008	-0.159740418195724
2009	-0.260052651166916
2010	-0.233622625470161
2011	-0.229752525687218
2012	-0.172369107604027
2013	-0.139015212655067
2014	-0.220252081751823
2015	-0.188147738575935
2016	-0.0281623397022486
2017	0.0136582739651203
2018	-0.00407756073400378
2019	0.0885664150118828
2020	0.109724149107933
2021	0.0948904007673264
2022	0.067307785153389