Year	Index
1980	49.19
1981	54.847
1982	60.332
1983	65.038
1984	72.647
1985	68.361
1986	65.49
1987	66.603
1988	63.073
1989	63.956
1990	62.933
1991	59.723
1992	60.38
1993	60.295
1994	80.017
1995	86.53
1996	90.335
1997	94.442
1998	96.768
1999	96.724
2000	100
2001	103.729
2002	106.626
2003	106.157
2004	106.771
2005	114.346
2006	115.97
2007	121.026
2008	130.09
2009	137.996
2010	141.534
2011	147.861
2012	154.922
2013	157.304
2014	157.137
2015	158.735
2016	159.116
2017	158.939
2018	163.786
2019	167.405
2020	170.759
2021	174.336
2022	176.74
2023	180.211
2024	183.755