Year	Index (Units)
1980	25.705
1981	21.790
1982	24.821
1983	27.817
1984	30.956
1985	31.810
1986	30.483
1987	31.600
1988	31.520
1989	32.098
1990	30.873
1991	31.107
1992	32.048
1993	32.810
1994	44.303
1995	50.993
1996	54.515
1997	56.515
1998	59.471
1999	65.160
2000	67.989
2001	69.329
2002	71.793
2003	73.991
2004	74.560
2005	77.762
2006	79.390
2007	79.700
2008	84.828
2009	86.982
2010	87.749
2011	91.024
2012	98.032
2013	99.402
2014	99.156
2015	100.000
2016	100.684
2017	100.313
2018	100.905
2019	100.584
2020	103.479
2021	105.154
2022	109.506
2023	112.226
2024	115.564
2025	117.881
2026	120.237
2027	122.636
2028	125.083
2029	127.578