Year	Index
1980	0.022
1981	0.034
1982	0.051
1983	0.072
1984	0.146
1985	0.305
1986	0.644
1987	1.814
1988	5.257
1989	11.322
1990	16.342
1991	19.286
1992	26.323
1993	30.757
1994	33.88
1995	36.767
1996	38.432
1997	41.456
1998	43.818
1999	45.251
2000	48.792
2001	48.38
2002	49.755
2003	53.02
2004	56.921
2005	58.991
2006	64.045
2007	69.371
2008	80.28
2009	94.273
2010	102.152
2011	115.699
2012	130.869
2013	134.98
2014	141.492
2015	146.587
2016	156.904
2017	164.377
2018	169.562
2019	175.713
2020	184.01
2021	193.573
2022	203.33
2023	213.285
2024	225.114