Year	Index
1980	0.057
1981	0.073
1982	0.117
1983	0.236
1984	0.39
1985	0.615
1986	1.147
1987	2.662
1988	5.682
1989	6.814
1990	8.63
1991	10.581
1992	12.223
1993	13.417
1994	14.354
1995	19.387
1996	26.046
1997	31.411
1998	36.41
1999	42.442
2000	46.468
2001	49.426
2002	51.916
2003	54.278
2004	56.826
2005	59.094
2006	61.241
2007	63.672
2008	66.938
2009	70.482
2010	73.411
2011	75.91
2012	79.031
2013	82.038
2014	85.336
2015	87.658
2016	90.131
2017	95.579
2018	100.26
2019	104.077
2020	107.312
2021	110.531
2022	113.847
2023	117.263
2024	120.781