Year	Index (Units)
1984	19.307
1985	21.469
1986	22.886
1987	24.923
1988	31.876
1989	33.980
1990	35.441
1991	37.036
1992	40.295
1993	47.870
1994	60.077
1995	66.145
1996	70.775
1997	71.059
1998	70.348
1999	69.644
2000	70.971
2001	70.637
2002	70.347
2003	72.643
2004	74.393
2005	75.641
2006	77.825
2007	82.985
2008	84.000
2009	85.370
2010	89.238
2011	92.893
2012	95.167
2013	97.596
2014	99.101
2015	100.762
2016	102.879
2017	104.607
2018	106.468
2019	111.249
2020	111.450
2021	113.032
2022	115.094
2023	114.793
2024	116.963
2025	119.324
2026	121.732
2027	124.190
2028	126.696
2029	129.254