Year	Index (Units)
1980	51.734
1981	57.632
1982	62.646
1983	64.650
1984	64.650
1985	63.099
1986	61.521
1987	60.475
1988	60.596
1989	61.324
1990	62.120
1991	62.678
1992	62.489
1993	64.113
1994	66.676
1995	68.770
1996	68.642
1997	71.801
1998	71.500
1999	70.600
2000	70.084
2001	69.261
2002	68.918
2003	70.075
2004	71.651
2005	73.526
2006	75.027
2007	77.466
2008	80.204
2009	82.438
2010	84.055
2011	83.773
2012	86.082
2013	88.924
2014	91.277
2015	92.964
2016	95.557
2017	96.881
2018	98.907
2019	99.903
2020	97.580
2021	96.983
2022	100.508
2023	100.583
2024	101.992
2025	103.827
2026	105.959
2027	108.134
2028	110.353
2029	112.618