Year	Index
1980	23.571
1981	25.374
1982	27.306
1983	28.659
1984	29.818
1985	30.655
1986	30.655
1987	30.591
1988	32.642
1989	41.021
1990	47.663
1991	51.55
1992	53.621
1993	55.393
1994	57.345
1995	58.694
1996	62.51
1997	64.409
1998	66.392
1999	66.789
2000	67.239
2001	68.428
2002	69.683
2003	70.817
2004	73.2
2005	75.755
2006	80.494
2007	84.312
2008	96.092
2009	95.381
2010	100.003
2011	104.166
2012	108.869
2013	114.122
2014	117.431
2015	116.401
2016	115.495
2017	119.334
2018	124.659
2019	127.177
2020	130.353
2021	133.625
2022	136.991
2023	140.443
2024	143.982