Year	Index (Units)
1986	5.103
1987	3.339
1988	12.243
1989	16.487
1990	27.410
1991	45.936
1992	54.023
1993	56.876
1994	65.678
1995	85.292
1996	93.146
1997	92.991
1998	81.046
1999	80.758
2000	80.251
2001	80.706
2002	83.907
2003	86.376
2004	94.797
2005	103.173
2006	110.173
2007	124.149
2008	149.088
2009	158.593
2010	177.236
2011	209.381
2012	223.682
2013	237.150
2014	241.554
2015	243.033
2016	254.546
2017	261.158
2018	268.948
2019	283.020
2020	283.550
2021	288.691
2022	301.823
2023	312.632
2024	323.914
2025	334.927
2026	346.281
2027	358.020
2028	370.156
2029	382.705