Year	Index (Units)
1980	37.114
1981	44.836
1982	48.814
1983	53.135
1984	55.856
1985	57.161
1986	58.906
1987	45.718
1988	48.272
1989	48.954
1990	56.494
1991	50.068
1992	50.174
1993	49.918
1994	73.157
1995	74.135
1996	84.190
1997	84.987
1998	69.871
1999	83.290
2000	106.682
2001	100.000
2002	100.417
2003	100.737
2004	108.098
2005	132.666
2006	143.927
2007	151.980
2008	174.031
2009	147.145
2010	171.603
2011	193.364
2012	187.676
2013	176.322
2014	174.619
2015	159.030
2016	152.240
2017	158.059
2018	168.829
2019	171.536
2020	156.240
2021	195.845
2022	222.400
2023	206.349
2024	205.916
2025	202.300
2026	200.440
2027	199.375
2028	199.262
2029	199.054