Year	Index
1980	4.774
1981	5.019
1982	5.306
1983	5.569
1984	5.922
1985	6.272
1986	6.507
1987	7.043
1988	8.278
1989	9.829
1990	12.352
1991	16.763
1992	20.369
1993	24.703
1994	29.518
1995	37.025
1996	45.183
1997	54.225
1998	61.58
1999	66.55
2000	73.115
2001	81.324
2002	88.107
2003	92.991
2004	97.629
2005	100
2006	103.535
2007	109.149
2008	114.606
2009	119.236
2010	122.046
2011	124.82
2012	129.024
2013	132.821
2014	137.275
2015	139.891
2016	141.13
2017	146.53
2018	153.165
2019	157.76
2020	162.493
2021	167.368
2022	172.389
2023	177.561
2024	182.888