1980/84=38,5; 1980/85=38,10; 1981/85=39,5; 1981/86=39,10; 1982/86=40,5; 1982/87=40,10; 1983/87=41,4; 1983/88=41,9; 1984/88=42,4; 1984/89=42,9; 1985/89=43,4; 1985/90=43,9; 1986/90=44,4; 1986/91=44,9; 1987/91=45,2;1987/92=45,6; 1988/92[,1]=46,2; 1988/92[,2]=46,6; 1989/93=47,2; 1990/94=48,2; 1991/95=49,2; 1992/96=50,2; 1993/97=51,2; 1994/98=52,2; 1995/99=53,2; 1996/2000=54,2; 1997/2001=55,2 von: Timber bulletin (ISSN: 0040-7747)