Year	Number
1996	-0.0265951305627823
1998	-0.0194181017577648
2000	-0.042195025831461
2002	-0.0708565190434456
2003	-0.103218950331211
2004	-0.238485977053642
2005	0.218686625361443
2006	0.30415141582489
2007	0.30298313498497
2008	0.259912490844727
2009	0.153789654374123
2010	0.169478163123131
2011	0.129435449838638
2012	0.141266375780106
2013	0.180733934044838
2014	0.358953505754471
2015	0.298591166734695
2016	0.300257742404938
2017	0.663341760635376
2018	0.647211670875549
2019	0.648035407066345
2020	0.712194919586182
2021	0.59258770942688
2022	0.55392199754715