Year	Index (Units)
1980	23.258
1981	27.244
1982	29.488
1983	28.149
1984	30.072
1985	30.072
1986	30.369
1987	25.673
1988	29.115
1989	36.666
1990	40.132
1991	42.880
1992	44.449
1993	45.319
1994	47.484
1995	49.475
1996	50.730
1997	53.933
1998	53.490
1999	55.000
2000	53.979
2001	56.014
2002	56.298
2003	57.906
2004	60.162
2005	62.672
2006	67.345
2007	70.446
2008	75.644
2009	77.910
2010	82.257
2011	84.753
2012	90.062
2013	92.802
2014	94.329
2015	92.690
2016	93.821
2017	97.077
2018	100.745
2019	101.431
2020	101.104
2021	103.475
2022	108.023
2023	110.193
2024	113.193
2025	115.947
2026	118.844
2027	121.815
2028	124.863
2029	127.986