Year	Index (Units)
1980	35.356
1981	39.497
1982	41.990
1983	42.493
1984	42.100
1985	41.663
1986	30.468
1987	32.522
1988	29.612
1989	32.152
1990	34.435
1991	33.656
1992	33.556
1993	32.998
1994	33.359
1995	35.300
1996	38.069
1997	39.386
1998	33.898
1999	38.809
2000	43.058
2001	42.349
2002	44.871
2003	45.911
2004	50.987
2005	61.261
2006	68.350
2007	74.116
2008	87.227
2009	73.520
2010	86.159
2011	99.439
2012	103.428
2013	102.505
2014	100.411
2015	83.906
2016	81.926
2017	87.158
2018	100.000
2019	97.977
2020	88.978
2021	100.813
2022	118.943
2023	115.417
2024	116.594
2025	116.492
2026	117.577
2027	119.212
2028	121.102
2029	123.920