Year	Index (Units)
1980	37.305
1981	40.421
1982	44.979
1983	47.305
1984	49.124
1985	52.764
1986	57.052
1987	62.115
1988	69.799
1989	72.997
1990	74.202
1991	76.136
1992	78.010
1993	79.424
1994	82.001
1995	83.972
1996	86.471
1997	88.052
1998	89.910
1999	91.262
2000	92.680
2001	94.055
2002	94.713
2003	93.896
2004	95.340
2005	99.593
2006	100.000
2007	103.734
2008	108.279
2009	110.267
2010	111.892
2011	113.029
2012	115.329
2013	114.237
2014	116.421
2015	119.936
2016	122.182
2017	121.045
2018	123.871
2019	123.939
2020	127.006
2021	131.324
2022	136.374
2023	143.236
2024	146.983
2025	149.976
2026	152.961
2027	156.004
2028	159.109
2029	162.275