Year	Index
1980	44.138
1981	50.609
1982	57.311
1983	65.654
1984	67.364
1985	74.408
1986	76.202
1987	70.878
1988	68.09
1989	68.529
1990	68.39
1991	66.442
1992	65.939
1993	64.021
1994	79.738
1995	95.048
1996	98.587
1997	100.162
1998	98.288
1999	96.897
2000	100
2001	103.843
2002	106.229
2003	110.853
2004	108.366
2005	111.493
2006	118.956
2007	120.069
2008	131.19
2009	135.811
2010	137.835
2011	139.482
2012	147.675
2013	157.352
2014	175.604
2015	183.506
2016	191.947
2017	199.817
2018	205.812
2019	211.986
2020	217.286
2021	222.718
2022	228.286
2023	233.993
2024	239.613