Year	Index (Units)
1980	2.898
1981	3.419
1982	3.789
1983	4.319
1984	5.037
1985	5.112
1986	5.520
1987	5.946
1988	6.777
1989	7.561
1990	9.187
1991	10.306
1992	11.479
1993	12.828
1994	13.912
1995	14.979
1996	17.367
1997	19.028
1998	20.811
1999	21.787
2000	23.133
2001	26.408
2002	28.930
2003	31.525
2004	34.367
2005	38.150
2006	41.942
2007	48.608
2008	59.475
2009	61.558
2010	65.383
2011	69.783
2012	75.050
2013	80.217
2014	82.450
2015	84.283
2016	87.642
2017	93.408
2018	97.400
2019	101.592
2020	106.233
2021	112.558
2022	163.450