Year	Index
1980	23.322
1981	25.054
1982	27.334
1983	30.475
1984	34.257
1985	37.507
1986	41.075
1987	44.811
1988	48.432
1989	52.022
1990	55.368
1991	57.976
1992	58.892
1993	60.109
1994	63.5
1995	67.116
1996	69.561
1997	72.502
1998	76.087
1999	78.519
2000	79.865
2001	81.791
2002	84.977
2003	88.705
2004	92.852
2005	97.62
2006	103.346
2007	110.778
2008	118.821
2009	127.108
2010	136.693
2011	147.661
2012	158.922
2013	169.052
2014	178.829
2015	190.158
2016	202.501
2017	214.496
2018	226.49
2019	239.161
2020	252.456
2021	266.352
2022	280.997
2023	296.452
2024	312.757