Year	Index
1980	6.42
1981	7.776
1982	7.057
1983	7.215
1984	7.965
1985	9.725
1986	13.186
1987	17.564
1988	19.007
1989	21.636
1990	24.946
1991	28.555
1992	30.828
1993	32.582
1994	35.111
1995	35.38
1996	36.837
1997	39.178
1998	39.418
1999	40.71
2000	42.188
2001	48.591
2002	56.414
2003	71.858
2004	80.635
2005	83.293
2006	80.389
2007	81.885
2008	87.489
2009	91.007
2010	98.426
2011	92.748
2012	97.318
2013	100
2014	107.909
2015	114.955
2016	122.285
2017	128.273
2018	135.615
2019	143.479
2020	151.286
2021	158.56
2022	165.554
2023	172.857
2024	180.482