Year	Index (Units)
1980	2.972
1981	3.515
1982	3.704
1983	4.498
1984	4.925
1985	4.998
1986	5.451
1987	6.006
1988	6.908
1989	7.952
1990	9.512
1991	10.369
1992	11.802
1993	13.020
1994	13.568
1995	15.130
1996	17.672
1997	19.570
1998	20.299
1999	21.108
2000	23.395
2001	25.926
2002	28.853
2003	32.368
2004	36.600
2005	39.400
2006	44.700
2007	53.000
2008	60.400
2009	63.500
2010	67.800
2011	71.100
2012	77.700
2013	81.300
2014	82.400
2015	86.200
2016	90.000
2017	96.400
2018	99.100
2019	103.900
2020	108.300
2021	121.400
2022	187.600