Year	Index (Units)
1980	55.109
1981	58.683
1982	62.011
1983	63.841
1984	65.715
1985	67.967
1986	68.472
1987	69.455
1988	70.755
1989	72.987
1990	76.931
1991	81.439
1992	84.727
1993	87.516
1994	88.261
1995	89.848
1996	90.576
1997	91.045
1998	91.062
1999	91.798
2000	93.231
2001	94.154
2002	94.758
2003	95.361
2004	96.124
2005	97.252
2006	98.286
2007	99.008
2008	101.412
2009	100.926
2010	101.620
2011	101.852
2012	101.146
2013	100.928
2014	100.915
2015	99.763
2016	99.331
2017	99.862
2018	100.796
2019	101.161
2020	100.428
2021	101.012
2022	103.875
2023	106.092
2024	107.722
2025	109.015
2026	110.283
2027	111.587
2028	112.926
2029	114.281