Year	Index
1980	0.071
1981	0.101
1982	0.117
1983	0.145
1984	0.239
1985	0.508
1986	0.642
1987	1.2
1988	1.923
1989	3.477
1990	4.625
1991	7.288
1992	12.35
1993	18.305
1994	21.084
1995	30.599
1996	46.184
1997	68.844
1998	74.401
1999	72.844
2000	79.116
2001	81.689
2002	84.386
2003	81.454
2004	82.123
2005	84.881
2006	86.538
2007	90.543
2008	100
2009	98.363
2010	99.416
2011	104.442
2012	106.594
2013	107.425
2014	106.317
2015	107.892
2016	109.508
2017	110.667
2018	112.221
2019	114.465
2020	116.926
2021	119.616
2022	122.546
2023	125.978
2024	129.757