Year	Index
1980	4.321
1981	4.517
1982	4.748
1983	5.678
1984	6.191
1985	6.44
1986	6.56
1987	7.421
1988	8.015
1989	8.816
1990	9.497
1991	10.315
1992	10.973
1993	11.857
1994	12.779
1995	14.042
1996	15.26
1997	17.178
1998	30.109
1999	34.372
2000	37.247
2001	42.571
2002	45.081
2003	47.555
2004	51.621
2005	59.02
2006	67.334
2007	74.915
2008	87.863
2009	93.162
2010	100
2011	107.466
2012	111.5
2013	117.037
2014	123.408
2015	128.32
2016	131.449
2017	137.069
2018	142.211
2019	146.91
2020	152.131
2021	157.17
2022	161.983
2023	166.835
2024	171.825