Year	Index (Units)
1980	6.259
1981	7.161
1982	7.296
1983	7.792
1984	8.333
1985	8.719
1986	8.886
1987	9.435
1988	10.694
1989	12.386
1990	16.141
1991	25.406
1992	31.171
1993	35.248
1994	44.468
1995	57.721
1996	71.279
1997	76.269
1998	73.881
1999	82.155
2000	100.476
2001	100.000
2002	101.379
2003	110.441
2004	123.046
2005	138.308
2006	153.265
2007	164.084
2008	188.978
2009	175.119
2010	202.333
2011	236.562
2012	255.411
2013	257.699
2014	261.471
2015	248.524
2016	250.693
2017	263.011
2018	279.115
2019	281.489
2020	268.276
2021	311.061
2022	382.190
2023	380.548
2024	405.473
2025	429.517
2026	455.286
2027	479.728
2028	503.843
2029	527.782