Year	Index
1980	0.076
1981	0.153
1982	0.178
1983	0.432
1984	0.458
1985	0.547
1986	0.73
1987	0.979
1988	1.239
1989	1.616
1990	2.197
1991	2.422
1992	2.745
1993	3.504
1994	4.702
1995	8.032
1996	10.13
1997	12.373
1998	14.322
1999	16.297
2000	22.904
2001	27.78
2002	31.994
2003	39.533
2004	44.189
2005	50.745
2006	56.288
2007	63.464
2008	74.973
2009	82.064
2010	87.701
2011	95.042
2012	102.764
2013	116.632
2014	136.445
2015	160.584
2016	185.253
2017	207.152
2018	226.676
2019	246.422
2020	266.136
2021	284.766
2022	303.276
2023	321.472
2024	340.76