Year	Index
1980	30.24
1981	36.203
1982	40.232
1983	43.996
1984	42.444
1985	41.674
1986	43.393
1987	43.416
1988	43.351
1989	42.938
1990	43.423
1991	43.527
1992	44.233
1993	44.194
1994	59.776
1995	69.219
1996	72.4
1997	76.242
1998	76.986
1999	76.945
2000	78.378
2001	81.45
2002	83.942
2003	83.162
2004	83.489
2005	89.152
2006	91.139
2007	92.001
2008	100
2009	103.714
2010	105.213
2011	108.963
2012	111.771
2013	113.811
2014	114.028
2015	116.063
2016	117.057
2017	116.181
2018	117.026
2019	119.154
2020	121.538
2021	123.968
2022	126.448
2023	128.978
2024	131.557