Year	Index
1980	4.85
1981	5.277
1982	5.166
1983	5.538
1984	5.937
1985	7.593
1986	9.226
1987	10.084
1988	11.324
1989	13.611
1990	21.751
1991	23.926
1992	27.323
1993	30.493
1994	34.03
1995	36.96
1996	40.97
1997	43.89
1998	47.17
1999	49.49
2000	52.01
2001	56.64
2002	60.22
2003	63.75
2004	69.63
2005	75.6
2006	79.98
2007	86.97
2008	95.15
2009	94.88
2010	100
2011	106.2
2012	109.86
2013	114.68
2014	118.06
2015	121.68
2016	126.83
2017	134.03
2018	137.134
2019	142.318
2020	148.2
2021	154.096
2022	160.439
2023	167.206
2024	174.406