Year	Index
1980	34.558
1981	43.835
1982	46.76
1983	47.533
1984	50.155
1985	50.69
1986	53.106
1987	61.624
1988	67.022
1989	72.215
1990	75.652
1991	80.546
1992	83.815
1993	86.803
1994	88.802
1995	90.782
1996	91.623
1997	94.201
1998	97.55
1999	99.5
2000	102.025
2001	105.675
2002	107.75
2003	111
2004	112.575
2005	113.925
2006	116.25
2007	120.825
2008	126.675
2009	132.118
2010	135.768
2011	136.955
2012	138.8
2013	140.825
2014	141.95
2015	145.475
2016	146.7
2017	151.225
2018	155.514
2019	158.611
2020	162.072
2021	165.608
2022	169.221
2023	172.913
2024	176.686