Year	Index (Units)
1986	1.379
1987	0.948
1988	1.166
1989	1.911
1990	4.620
1991	13.444
1992	23.526
1993	50.421
1994	55.685
1995	61.297
1996	65.678
1997	72.576
1998	81.937
1999	83.573
2000	82.883
2001	82.786
2002	82.756
2003	83.606
2004	86.887
2005	92.404
2006	98.080
2007	105.601
2008	131.999
2009	131.124
2010	136.365
2011	143.838
2012	148.056
2013	152.415
2014	158.288
2015	160.211
2016	165.073
2017	169.870
2018	174.049
2019	177.432
2020	182.645
2021	187.981
2022	197.995
2023	202.238
2024	206.824
2025	213.110
2026	219.588
2027	226.176
2028	232.961
2029	239.950