Year	Index
1980	4.308
1981	4.967
1982	5.683
1983	6.392
1984	7.117
1985	8.283
1986	9.808
1987	11.4
1988	12.875
1989	14.775
1990	16.875
1991	19.442
1992	22.175
1993	24.317
1994	26.467
1995	28.783
1996	30.9
1997	33.567
1998	35.908
1999	37.733
2000	39.767
2001	42.008
2002	45.85
2003	48.542
2004	49.233
2005	50.883
2006	53.233
2007	57.042
2008	63.308
2009	67.817
2010	70.708
2011	74.233
2012	78.408
2013	82.925
2014	87.975
2015	92
2016	97.833
2017	102.992
2018	107.75
2019	113.09
2020	119.198
2021	125.754
2022	132.67
2023	139.967
2024	147.666