Year	Index (Units)
1980	21.076
1981	20.337
1982	20.357
1983	21.253
1984	15.971
1985	17.769
1986	19.370
1987	21.772
1988	24.149
1989	25.838
1990	26.854
1991	29.707
1992	33.178
1993	35.672
1994	36.004
1995	34.224
1996	35.243
1997	35.214
1998	36.204
1999	38.597
2000	39.679
2001	41.673
2002	44.855
2003	49.967
2004	54.118
2005	58.442
2006	69.129
2007	72.202
2008	75.483
2009	79.238
2010	85.372
2011	85.779
2012	89.376
2013	87.257
2014	87.267
2015	91.878
2016	94.685
2017	100.000
2018	105.140
2019	113.193
2020	108.462
2021	106.356
2022	115.418
2023	127.010
2024	134.366
2025	139.897
2026	144.690
2027	149.332
2028	154.410
2029	159.345