Year	Number
1996	0.365160435438156
1998	0.426935762166977
2000	0.240109741687775
2002	0.410831212997437
2003	0.257701814174652
2004	0.452396661043167
2005	0.173916295170784
2006	0.414196908473969
2007	0.230479195713997
2008	0.209998890757561
2009	-0.07557762414217
2010	-0.182899221777916
2011	-0.708379745483398
2012	-2.03432869911194
2013	-1.72216212749481
2014	-1.71398878097534
2015	-1.6827712059021
2016	-1.61284875869751
2017	-1.90349066257477
2018	-2.08446145057678
2019	-2.21420574188232
2020	-2.14628767967224
2021	-2.33280539512634
2022	-2.47940897941589