Year	Index
1980	0.022
1981	0.022
1982	0.021
1983	0.02
1984	0.019
1985	0.018
1986	0.019
1987	0.019
1988	0.019
1989	0.019
1990	0.021
1991	0.063
1992	0.188
1993	0.616
1994	1.471
1995	1.99
1996	2.891
1997	7.146
1998	11.096
1999	16.389
2000	23.327
2001	32.163
2002	39.443
2003	48.675
2004	56.217
2005	63.022
2006	69.67
2007	79.979
2008	92.788
2009	96.58
2010	100
2011	103.785
2012	107.945
2013	111.607
2014	113.552
2015	116.514
2016	119.375
2017	124.931
2018	132.398
2019	137.459
2020	142.599
2021	147.397
2022	151.847
2023	156.449
2024	161.191