Year	Index (Units)
1980	0.015
1981	0.024
1982	0.036
1983	0.050
1984	0.101
1985	0.212
1986	0.447
1987	1.260
1988	3.651
1989	7.863
1990	11.350
1991	13.394
1992	18.282
1993	21.361
1994	23.530
1995	25.535
1996	26.692
1997	28.792
1998	30.432
1999	31.428
2000	33.887
2001	33.600
2002	34.555
2003	36.823
2004	39.532
2005	40.970
2006	44.480
2007	48.179
2008	55.755
2009	65.474
2010	66.888
2011	80.185
2012	87.515
2013	90.880
2014	92.843
2015	92.867
2016	98.359
2017	101.458
2018	106.944
2019	109.653
2020	111.807
2021	115.101
2022	123.942
2023	130.148
2024	134.862
2025	141.141
2026	148.131
2027	155.754
2028	163.705
2029	171.620