Year	Number
1996	-1.09399676322937
1998	-1.49545300006866
2000	-1.49640619754791
2002	-1.39595544338226
2003	-1.30027616024017
2004	-1.19036209583282
2005	-1.4419127702713
2006	-1.59623646736145
2007	-1.42256093025208
2008	-1.24682021141052
2009	-1.15703141689301
2010	-1.18830907344818
2011	-1.32364177703857
2012	-1.17406153678894
2013	-1.15944516658783
2014	-1.09945023059845
2015	-1.16640019416809
2016	-1.09083259105682
2017	-0.859125554561615
2018	-0.815192759037018
2019	-0.673096418380737
2020	-0.799875795841217
2021	-0.928987920284271
2022	-1.33121407032013