Year	Index
1980	17.351
1981	18.212
1982	20.019
1983	22.448
1984	25.377
1985	27.408
1986	28.826
1987	30.857
1988	33.382
1989	36.341
1990	39.76
1991	43.873
1992	47.446
1993	51.998
1994	56.936
1995	60.97
1996	66.322
1997	71.994
1998	77.458
1999	84.475
2000	90.543
2001	93.915
2002	96.675
2003	99.065
2004	102.38
2005	107.265
2006	112.791
2007	118.521
2008	126.561
2009	134.49
2010	142.19
2011	152.536
2012	166.681
2013	185.55
2014	203.243
2015	218.741
2016	235.458
2017	248.507
2018	257.569
2019	267.839
2020	279.975
2021	292.999
2022	306.958
2023	321.442
2024	335.829