Year	Index (Units)
1980	8.331
1981	9.001
1982	8.840
1983	8.841
1984	9.028
1985	8.827
1986	8.632
1987	8.868
1988	8.925
1989	9.251
1990	9.710
1991	9.005
1992	10.020
1993	10.368
1994	10.729
1995	13.593
1996	15.235
1997	16.901
1998	17.098
1999	20.410
2000	23.045
2001	23.645
2002	30.953
2003	34.443
2004	41.679
2005	54.193
2006	66.742
2007	68.370
2008	84.580
2009	63.565
2010	75.819
2011	94.275
2012	99.915
2013	100.000
2014	98.993
2015	92.023
2016	96.342
2017	98.082
2018	101.611
2019	105.853
2020	100.822
2021	191.969
2022	273.935
2023	259.303
2024	257.773
2025	251.696
2026	248.837
2027	246.474
2028	243.911
2029	244.598