Year	Number
1996	-0.122391536831856
1998	-0.251117050647736
2000	-0.506525874137878
2002	-0.456348478794098
2003	-0.400354266166687
2004	-0.474593609571457
2005	-0.395821034908295
2006	-0.256909370422363
2007	-0.164958506822586
2008	-0.115736693143845
2009	-0.134577691555023
2010	-0.0789327323436737
2011	-0.0832900106906891
2012	-0.113736905157566
2013	-0.104938998818398
2014	-0.10282789170742
2015	-0.0699239894747734
2016	-0.0631169751286507
2017	-0.043700598180294
2018	0.0319394469261169
2019	0.0529923103749752
2020	0.0467247739434242
2021	0.00417369697242975
2022	0.00182483578100801