Year	Index (Units)
1980	11.044
1981	13.063
1982	13.317
1983	13.965
1984	15.353
1985	15.806
1986	19.928
1987	25.152
1988	32.506
1989	38.855
1990	45.226
1991	47.426
1992	49.952
1993	51.779
1994	60.014
1995	64.224
1996	75.470
1997	82.344
1998	82.707
1999	88.466
2000	100.000
2001	102.869
2002	107.522
2003	105.444
2004	116.332
2005	130.234
2006	142.081
2007	157.382
2008	182.485
2009	177.410
2010	189.955