Year	Index (Units)
1980	30.081
1981	30.316
1982	31.363
1983	32.452
1984	33.584
1985	34.761
1986	35.985
1987	37.258
1988	32.409
1989	28.636
1990	29.063
1991	31.201
1992	30.346
1993	30.346
1994	36.244
1995	46.682
1996	49.250
1997	57.130
1998	55.701
1999	57.818
2000	56.026
2001	60.695
2002	58.962
2003	62.915
2004	63.611
2005	65.553
2006	77.410
2007	74.364
2008	83.149
2009	81.675
2010	83.825
2011	85.321
2012	91.694
2013	93.607
2014	94.053
2015	97.904
2016	97.869
2017	99.616
2018	100.510
2019	101.900
2020	102.500
2021	104.031
2022	107.372
2023	112.203
2024	116.243
2025	119.730
2026	123.322
2027	127.022
2028	130.832
2029	134.757