Year	Index (Units)
1981	0.012
1982	0.024
1983	0.059
1984	0.071
1985	0.178
1986	0.440
1987	1.499
1988	4.473
1989	7.924
1990	10.053
1991	13.303
1992	22.124
1993	21.602
1994	23.256
1995	25.922
1996	27.331
1997	30.182
1998	29.910
1999	32.439
2000	33.807
2001	32.312
2002	34.160
2003	36.178
2004	39.074
2005	40.509
2006	44.918
2007	47.246
2008	53.971
2009	59.874
2010	61.720
2011	78.390
2012	82.500
2013	88.060
2014	89.640
2015	95.420
2016	100.810
2017	103.840
2018	106.250
2019	108.770
2020	111.442
2021	114.652
2022	126.383
2023	129.672
2024	135.319
2025	142.142
2026	149.299
2027	156.764
2028	164.602
2029	172.833