Year	Index
1980	25.432
1981	24.539
1982	24.564
1983	25.646
1984	19.271
1985	21.441
1986	23.373
1987	26.272
1988	29.139
1989	31.178
1990	32.403
1991	35.847
1992	40.034
1993	43.043
1994	43.444
1995	41.987
1996	44.618
1997	44.557
1998	45.706
1999	48.692
2000	51.369
2001	54.529
2002	59.488
2003	63.916
2004	67.821
2005	75.983
2006	84.503
2007	90.263
2008	92.247
2009	92.88
2010	97.305
2011	101.201
2012	102.631
2013	103.419
2014	104.748
2015	106.824
2016	111.566
2017	115.331
2018	117.846
2019	121.19
2020	123.786
2021	126.38
2022	129.027
2023	131.728
2024	134.494