Year	Index (Units)
1980	1.402
1981	1.595
1982	1.681
1983	1.896
1984	2.293
1985	2.863
1986	3.771
1987	4.588
1988	5.624
1989	7.063
1990	9.759
1991	12.128
1992	13.960
1993	16.511
1994	19.912
1995	22.577
1996	24.789
1997	26.512
1998	29.575
1999	31.572
2000	34.408
2001	36.925
2002	40.792
2003	46.600
2004	48.608
2005	51.925
2006	56.892
2007	61.525
2008	67.792
2009	69.558
2010	72.783
2011	78.783
2012	81.692
2013	83.867
2014	88.083
2015	90.842
2016	94.550
2017	97.967
2018	101.858
2019	104.667
2020	106.517
2021	111.617
2022	122.517
2023	128.192
2024	133.110
2025	138.435
2026	143.972
2027	149.731
2028	155.720
2029	161.949