Year	Index
1980	4.7
1981	5.3
1982	6
1983	6.7
1984	7.5
1985	8.9
1986	10.5
1987	12.1
1988	13.6
1989	15.7
1990	18
1991	20.9
1992	22.9
1993	25.1
1994	27.5
1995	29.4
1996	32.2
1997	34.2
1998	37.3
1999	38.1
2000	40.7
2001	42.6
2002	47.9
2003	48
2004	49.7
2005	51.5
2006	54.5
2007	59.3
2008	65.269
2009	69.386
2010	71.796
2011	76.214
2012	80.532
2013	84.85
2014	89.369
2015	94.088
2016	100.414
2017	105.151
2018	110.324
2019	116.172
2020	122.561
2021	129.302
2022	136.414
2023	143.916
2024	151.832