Year	Index
1980	0.057
1981	0.123
1982	0.151
1983	0.335
1984	0.469
1985	0.518
1986	0.645
1987	0.901
1988	1.184
1989	1.483
1990	2.035
1991	2.403
1992	2.644
1993	3.304
1994	4.126
1995	6.573
1996	9.497
1997	11.855
1998	14.132
1999	15.895
2000	19.886
2001	26.435
2002	30.36
2003	38.443
2004	43.312
2005	49.85
2006	55.674
2007	61.647
2008	71.822
2009	81.259
2010	86.702
2011	93.357
2012	99.959
2013	111.621
2014	128.907
2015	151.019
2016	177.378
2017	199.323
2018	218.931
2019	238.784
2020	258.736
2021	278.141
2022	296.916
2023	315.473
2024	334.401