Year	Index (Units)
1980	0.824
1981	1.058
1982	1.359
1983	1.745
1984	2.242
1985	2.879
1986	3.698
1987	4.750
1988	6.101
1989	7.836
1990	11.289
1991	12.626
1992	14.870
1993	17.900
1994	21.174
1995	23.405
1996	25.319
1997	26.888
1998	30.826
1999	32.491
2000	35.300
2001	38.200
2002	43.800
2003	47.900
2004	49.200
2005	54.100
2006	60.800
2007	64.500
2008	69.300
2009	70.600
2010	75.700
2011	79.400
2012	82.600
2013	85.700
2014	89.300
2015	92.100
2016	95.700
2017	100.000
2018	103.200
2019	106.100
2020	108.400
2021	115.800
2022	125.200
2023	129.800
2024	134.992
2025	140.392
2026	146.007
2027	151.848
2028	157.922
2029	164.238