Year	Index
1980	17.22
1981	16.757
1982	17.29
1983	18.876
1984	18.876
1985	18.876
1986	18.876
1987	18.876
1988	24.339
1989	23.723
1990	24.701
1991	26.428
1992	27.193
1993	26.514
1994	28.436
1995	32.989
1996	33.944
1997	37.763
1998	39.763
1999	44.164
2000	49.93
2001	53.342
2002	59.715
2003	63.804
2004	64.485
2005	69.587
2006	76.149
2007	76.412
2008	85.327
2009	81.16
2010	89.212
2011	97.092
2012	96.544
2013	100
2014	103.05
2015	98.513
2016	101.057
2017	108.435
2018	116.931
2019	116.528
2020	119.592
2021	122.716
2022	126.053
2023	128.736
2024	131.035