Year	Index (Units)
1980	15.378
1981	17.599
1982	24.712
1983	30.828
1984	38.731
1985	59.172
1986	57.442
1987	58.314
1988	60.633
1989	57.725
1990	61.033
1991	63.344
1992	54.276
1993	53.088
1994	66.030
1995	66.030
1996	72.634
1997	63.593
1998	43.157
1999	59.709
2000	51.365
2001	47.824
2002	46.853
2003	62.250
2004	68.603
2005	87.166
2006	100.000
2007	103.038
2008	123.480
2009	97.759
2010	122.108
2011	142.921
2012	149.859
2013	148.252
2014	146.363
2015	116.809
2016	109.467
2017	123.415
2018	135.157
2019	130.881
2020	117.568
2021	140.995
2022	147.327
2023	133.119
2024	138.356
2025	146.027
2026	153.658
2027	158.378
2028	164.225
2029	168.153