Year	Index (Units)
1980	5.802
1981	6.771
1982	9.362
1983	14.984
1984	23.902
1985	38.564
1986	33.353
1987	34.395
1988	34.279
1989	31.470
1990	33.668
1991	33.645
1992	34.593
1993	33.645
1994	48.363
1995	54.020
1996	54.019
1997	56.032
1998	59.723
1999	60.394
2000	64.390
2001	72.233
2002	76.711
2003	81.209
2004	85.346
2005	88.046
2006	91.398
2007	94.813
2008	100.000
2009	104.997
2010	110.697
2011	116.143
2012	119.121
2013	124.917
2014	128.133
2015	130.187
2016	132.791
2017	132.492
2018	135.923
2019	141.773
2020	140.868
2021	144.919
2022	152.195
2023	155.439
2024	164.280
2025	164.936
2026	168.484
2027	172.322
2028	175.422
2029	177.762