Year	Index
1980	17.776
1981	18.22
1982	18.584
1983	18.956
1984	19.468
1985	21.279
1986	22.662
1987	24.316
1988	28.887
1989	34.087
1990	35.144
1991	36.339
1992	38.664
1993	44.348
1994	55.036
1995	64.447
1996	69.796
1997	71.75
1998	71.176
1999	70.18
2000	70.46
2001	70.954
2002	70.386
2003	71.231
2004	74.009
2005	75.341
2006	76.471
2007	80.142
2008	84.87
2009	84.276
2010	87.057
2011	91.758
2012	94.186
2013	96.658
2014	98.58
2015	100
2016	102.003
2017	103.592
2018	105.767
2019	108.176
2020	110.888
2021	113.992
2022	117.298
2023	120.817
2024	124.442