Year	Index (Units)
1980	47.748
1981	49.633
1982	46.711
1983	42.228
1984	40.858
1985	39.632
1986	33.969
1987	37.342
1988	34.485
1989	37.423
1990	43.054
1991	39.405
1992	39.877
1993	37.694
1994	37.533
1995	38.253
1996	41.151
1997	40.178
1998	34.574
1999	38.314
2000	45.036
2001	42.946
2002	44.962
2003	49.295
2004	55.455
2005	67.508
2006	77.339
2007	83.572
2008	110.858
2009	83.097
2010	95.042
2011	110.139
2012	114.111
2013	111.577
2014	113.538
2015	91.799
2016	83.412
2017	89.500
2018	99.999
2019	97.335
2020	86.837
2021	97.862
2022	121.981
2023	114.593
2024	113.027
2025	111.780
2026	111.605
2027	112.173
2028	113.323
2029	112.860