Year	Number
1996	-2.35202503204346
1998	-2.18257474899292
2000	-2.06396865844727
2002	-2.06824994087219
2003	-2.03996181488037
2004	-2.29937267303467
2005	-2.2069251537323
2006	-2.49331307411194
2007	-2.43264842033386
2008	-2.54772567749023
2009	-2.49045586585999
2010	-2.3012433052063
2011	-2.33204579353333
2012	-2.22469043731689
2013	-2.20779252052307
2014	-2.0722336769104
2015	-2.10189485549927
2016	-2.18458890914917
2017	-2.2013144493103
2018	-2.08894062042236
2019	-2.14859175682068
2020	-1.95361256599426
2021	-1.83623266220093
2022	-1.90015578269958