Year	Number
1996	-1.64815735816956
1998	-1.53362345695496
2000	-1.3816899061203
2002	-1.08354067802429
2003	-1.06657803058624
2004	-1.18313717842102
2005	-1.10024237632751
2006	-1.18217408657074
2007	-1.29604709148407
2008	-1.29554963111877
2009	-1.27246570587158
2010	-1.21289575099945
2011	-1.23239934444427
2012	-1.2076199054718
2013	-1.26313161849976
2014	-1.01177895069122
2015	-1.07439470291138
2016	-1.16580295562744
2017	-1.37690246105194
2018	-1.30321049690247
2019	-1.25325226783752
2020	-1.24842262268066
2021	-1.20692694187164
2022	-1.25580060482025