Year	Index
1980	1.003
1981	1.055
1982	1.175
1983	1.391
1984	1.793
1985	2.205
1986	2.385
1987	2.498
1988	3.1
1989	3.558
1990	5.413
1991	8.289
1992	15.485
1993	20.944
1994	27.328
1995	33.651
1996	39.899
1997	43.955
1998	48.051
1999	51.408
2000	56.908
2001	61.39
2002	67.846
2003	75.733
2004	85.47
2005	95.273
2006	103.703
2007	115.429
2008	131.074
2009	144.922
2010	159.105
2011	168.841
2012	179.736
2013	195.443
2014	209.234
2015	223.302
2016	233.46
2017	249.887
2018	259.539
2019	269.039
2020	281.432
2021	295.454
2022	310.227
2023	325.738
2024	342.025