Field.

no.1-7; no.1-7 1969-1972; no.2; no.3; no.4; no.5; no.8-15; no.8-13 1973-1975; no.14-19 1976-1978; no.16-19; no.19; no.20; no.21; no.22-25; no.22-23 1980; no.20-25 1979-1981; no.24-25 1981; no.26-29; no.26-29 1982-1983; no.27; no.28-29 1983; no.30-31 1984; no.30-33 1984-1985; no.32-33 1985; no.34; no.34-37 1986-1987; no.35; no.36; no.37; no.38; no.38-39,41 1988-1989; no.39; no.40; no.40 1989; no.41; no.42; no.42-45 1990-1991; no.43; no.44; no.45; no.46; no.46-48 1992-1993; no.51-53 1994-1995; no.54-57 1996-1997; no.58-59 1998; no.60-61 1999; no.62-63 2000; no.64-65 2001; no.66-69 2002-2003