1981/1-4; 1982/5-7; 1983/8-10; 1984/11-14; 1985/15-17; 1986/18, 19; 1987/21, 23; 1988/1-12; 1989/2,3; 1993/7-12; 1994/1-12; 1995/1, 4-10