Year	Index
1980	4.738
1981	7.148
1982	10.795
1983	19.893
1984	25.696
1985	34.016
1986	41.252
1987	48.992
1988	61.463
1989	70.381
1990	81.297
1991	86.832
1992	90.269
1993	93.955
1994	95.413
1995	96.992
1996	99.178
1997	100.955
1998	102.675
1999	105.983
2000	111.408
2001	118.533
2002	124.667
2003	127.241
2004	131.25
2005	136.5
2006	145.613
2007	152.986
2008	172.382
2009	193.073
2010	203.491
2011	211.633
2012	222.608
2013	231.228
2014	235.955
2015	239.808
2016	243.878
2017	248.172
2018	254.83
2019	261.942
2020	268.598
2021	275.313
2022	282.196
2023	289.251
2024	296.482