Year	Index (Units)
1980	42.166
1981	42.496
1982	43.963
1983	45.490
1984	47.076
1985	48.727
1986	50.442
1987	52.226
1988	45.430
1989	41.077
1990	41.218
1991	45.075
1992	43.650
1993	41.860
1994	44.999
1995	47.833
1996	51.373
1997	57.897
1998	59.171
1999	60.946
2000	61.251
2001	61.768
2002	63.612
2003	64.687
2004	67.061
2005	68.715
2006	71.915
2007	73.781
2008	78.223
2009	81.618
2010	81.937
2011	83.379
2012	87.556
2013	91.611
2014	92.446
2015	95.375
2016	98.418
2017	98.860
2018	100.000
2019	100.400
2020	101.779
2021	103.783
2022	106.923
2023	111.734
2024	115.757
2025	119.230
2026	122.807
2027	126.491
2028	130.285
2029	134.194