Year	Number
1996	0.0745114460587502
1998	0.0272596124559641
2000	-0.38852921128273
2002	-0.386543154716492
2003	-0.550385236740112
2004	-0.628952264785767
2005	-0.333545029163361
2006	-0.406893372535706
2007	-0.46309170126915
2008	-0.550221860408783
2009	-0.574997305870056
2010	-0.553793609142303
2011	-0.506389260292053
2012	-0.522410273551941
2013	-0.468730181455612
2014	-0.369280576705933
2015	-0.417118787765503
2016	-0.430538147687912
2017	-0.499839574098587
2018	-0.564711272716522
2019	-0.573691070079803
2020	-0.650772929191589
2021	-0.666893661022186
2022	-0.518337488174438