Year	Index (Units)
1980	4.513
1981	5.189
1982	5.756
1983	6.827
1984	8.088
1985	8.138
1986	8.626
1987	9.320
1988	10.240
1989	11.364
1990	13.673
1991	14.277
1992	16.834
1993	18.399
1994	19.741
1995	21.466
1996	22.014
1997	23.134
1998	26.896
1999	28.402
2000	29.790
2001	33.999
2002	36.842
2003	38.739
2004	42.148
2005	46.540
2006	51.788
2007	59.053
2008	68.695
2009	72.734
2010	78.043
2011	81.149
2012	89.639
2013	95.245
2014	97.074
2015	100.000
2016	105.443
2017	111.214
2018	115.991
2019	120.480
2020	124.421
2021	134.992
2022	200.932