Year	Index
1980	6.622
1981	7.305
1982	8.082
1983	8.967
1984	9.916
1985	10.809
1986	11.849
1987	12.449
1988	13.126
1989	14.444
1990	16.02
1991	17.957
1992	20.911
1993	26.216
1994	29.584
1995	32.996
1996	39.961
1997	44.507
1998	47.39
1999	49.264
2000	52.373
2001	53.418
2002	54.121
2003	57.672
2004	61.805
2005	64.894
2006	71.941
2007	77.79
2008	89.576
2009	100
2010	102.094
2011	113.111
2012	123.721
2013	130.116
2014	140.614
2015	154.71
2016	167.294
2017	181.79
2018	189.077
2019	200.493
2020	211.215
2021	221.919
2022	233.098
2023	244.874
2024	257.276