Year	Index (Units)
1980	0.034
1981	0.041
1982	0.083
1983	0.101
1984	0.178
1985	0.205
1986	0.241
1987	0.302
1988	0.484
1989	1.700
1990	11.656
1991	19.850
1992	28.386
1993	38.406
1994	50.773
1995	64.926
1996	77.846
1997	89.445
1998	100.000
1999	107.300
2000	118.137
2001	124.635
2002	127.003
2003	127.936
2004	132.463
2005	135.390
2006	137.010
2007	140.397
2008	146.492
2009	152.037
2010	155.975
2011	162.567
2012	168.625
2013	170.509
2014	170.687
2015	169.111
2016	167.965
2017	171.272
2018	174.299
2019	178.210
2020	184.231
2021	193.671
2022	221.482
2023	246.785
2024	259.158
2025	272.026
2026	281.770
2027	289.942
2028	297.190
2029	304.620