Year	Index (Units)
1980	5.861
1981	6.456
1982	6.330
1983	6.994
1984	7.758
1985	9.177
1986	10.529
1987	12.040
1988	14.256
1989	16.236
1990	18.432
1991	21.389
1992	24.188
1993	26.735
1994	29.186
1995	32.321
1996	34.627
1997	37.776
1998	41.308
1999	44.435
2000	47.777
2001	53.343
2002	58.769
2003	61.029
2004	66.340
2005	71.110
2006	74.615
2007	74.166
2008	83.439
2009	86.080
2010	91.614
2011	98.424
2012	102.605
2013	114.199
2014	129.040
2015	138.485
2016	138.865
2017	145.059
2018	158.966
2019	165.659
2020	174.344
2021	180.440
2022	194.731
2023	205.691
2024	216.792
2025	227.615
2026	239.203
2027	250.825
2028	262.862
2029	275.606