Year	Index
1980	17.924
1981	21.416
1982	22.746
1983	25.173
1984	27.8
1985	31.358
1986	34.684
1987	38.209
1988	41.069
1989	44.594
1990	49.848
1991	50.812
1992	51.577
1993	54.385
1994	59.158
1995	63.729
1996	64.196
1997	68.02
1998	76.642
1999	78.997
2000	80.224
2001	82.213
2002	85.364
2003	90.911
2004	95.915
2005	102.691
2006	111.946
2007	127.634
2008	136.17
2009	146.588
2010	163.519
2011	175.969
2012	188.526
2013	202.374
2014	214.735
2015	227.388
2016	240.434
2017	254.241
2018	268.082
2019	282.499
2020	297.91
2021	314.295
2022	331.581
2023	349.818
2024	369.058