Year	Index (Units)
1980	0.046
1981	0.055
1982	0.065
1983	0.070
1984	0.082
1985	0.140
1986	0.273
1987	1.602
1988	4.085
1989	7.035
1990	11.881
1991	17.836
1992	35.644
1993	44.461
1994	48.123
1995	53.070
1996	57.783
1997	62.260
1998	65.092
1999	65.249
2000	65.017
2001	64.778
2002	65.917
2003	66.753
2004	67.869
2005	66.901
2006	69.639
2007	72.465
2008	80.217
2009	81.192
2010	84.408
2011	88.617
2012	94.442
2013	99.692
2014	100.817
2015	97.025
2016	96.242
2017	100.558
2018	106.650
2019	109.733
2020	202.875
2021	516.842
2022	1401.650