Year	Index (Units)
1980	26.902
1981	29.088
1982	30.959
1983	33.397
1984	40.176
1985	42.213
1986	36.703
1987	35.701
1988	41.020
1989	39.010
1990	39.205
1991	40.852
1992	39.300
1993	35.026
1994	49.482
1995	52.136
1996	58.043
1997	61.278
1998	63.887
1999	58.491
2000	60.727
2001	68.276
2002	71.820
2003	70.562
2004	67.173
2005	70.161
2006	76.925
2007	71.202
2008	77.135
2009	84.927
2010	83.135
2011	84.822
2012	91.198
2013	91.401
2014	92.938
2015	97.430
2016	95.859
2017	94.984
2018	98.809
2019	97.850
2020	103.055
2021	101.381
2022	108.362
2023	111.268
2024	114.703
2025	118.244
2026	121.894
2027	125.657
2028	129.536
2029	133.535