Year	Index
1980	14.707
1981	15.874
1982	16.665
1983	20.041
1984	21.61
1985	24.376
1986	27.884
1987	31.423
1988	35.136
1989	39.093
1990	43.282
1991	48.712
1992	57.717
1993	63.938
1994	67.016
1995	71.238
1996	76.804
1997	82.229
1998	85.668
1999	93.219
2000	97.465
2001	100
2002	103.935
2003	107.126
2004	111.589
2005	118.418
2006	127.134
2007	136.8
2008	144.488
2009	167.473
2010	192.84
2011	213.689
2012	227.867
2013	242.854
2014	265.566
2015	278.693
2016	293.062
2017	318.532
2018	341.036
2019	357.739
2020	380.992
2021	404.614
2022	427.677
2023	451.199
2024	475.112