Year	Index
1980	24.534
1981	27.894
1982	29.242
1983	29.816
1984	30.546
1985	31.467
1986	31.904
1987	33.835
1988	36.265
1989	38.104
1990	41.662
1991	45.516
1992	47.545
1993	50.303
1994	53.104
1995	55.628
1996	58.368
1997	62.205
1998	64.672
1999	65.548
2000	67.37
2001	69.501
2002	72.096
2003	74.561
2004	76.824
2005	78.836
2006	80.483
2007	83.386
2008	86.837
2009	89.269
2010	91.977
2011	95.802
2012	97.168
2013	98.279
2014	99.098
2015	100.22
2016	101.56
2017	102.99
2018	104.35
2019	105.811
2020	107.451
2021	109.278
2022	111.245
2023	113.359
2024	115.626