Year	Index
1980	21.718
1981	22.723
1982	24.129
1983	25.897
1984	28.031
1985	30.277
1986	32.319
1987	33.464
1988	35.77
1989	39.21
1990	41.727
1991	44.732
1992	48.871
1993	53.127
1994	59.575
1995	65.718
1996	71.179
1997	78.736
1998	87.561
1999	95.165
2000	99.185
2001	102.737
2002	107.966
2003	112.17
2004	116.03
2005	121.704
2006	128.54
2007	134.03
2008	139.91
2009	147.278
2010	155.336
2011	166.699
2012	181.458
2013	194.825
2014	207.81
2015	218.943
2016	227.637
2017	241.227
2018	251.829
2019	262.474
2020	271.943
2021	281.032
2022	293.116
2023	305.72
2024	318.866