Year	Index (Units)
1980	31.595
1981	34.308
1982	31.685
1983	32.766
1984	38.691
1985	38.869
1986	40.614
1987	43.156
1988	43.358
1989	45.075
1990	48.831
1991	51.500
1992	52.408
1993	52.936
1994	54.304
1995	57.045
1996	57.318
1997	58.978
1998	60.390
1999	61.816
2000	62.505
2001	61.920
2002	62.182
2003	65.436
2004	65.905
2005	70.450
2006	73.891
2007	76.099
2008	77.778
2009	77.779
2010	80.859
2011	82.715
2012	84.591
2013	89.859
2014	93.479
2015	96.805
2016	96.410
2017	99.765
2018	100.000
2019	102.223
2020	96.890
2021	105.714
2022	113.485
2023	118.195
2024	120.865
2025	123.834
2026	126.930
2027	130.103
2028	133.356
2029	136.690