Year	Index (Units)
1980	17.111
1981	17.647
1982	17.718
1983	17.915
1984	18.788
1985	20.681
1986	21.664
1987	22.769
1988	25.533
1989	27.790
1990	29.415
1991	31.295
1992	33.788
1993	38.892
1994	46.823
1995	53.211
1996	56.727
1997	57.641
1998	57.060
1999	56.305
2000	57.498
2001	58.714
2002	59.142
2003	60.764
2004	64.923
2005	67.786
2006	70.378
2007	75.881
2008	81.415
2009	81.307
2010	86.375
2011	93.437
2012	96.468
2013	99.028
2014	99.976
2015	100.000
2016	100.876
2017	104.818
2018	108.470
2019	110.754
2020	112.144
2021	115.470
2022	117.718
2023	116.387
2024	117.914
2025	120.116
2026	122.413
2027	124.848
2028	127.301
2029	129.792