Holdings
2.1964,4; 3.1965,3u.4; 4.1966,1; 5.1967,5; 6.1968 - 7.1969; 8.1970,1-3u.5-6; 9.1971,1u.3-5; 10.1972,1u.2u.4u.6; 11.1973,1-5; 12.1974,1-4; 13.1975,1-4; 14.1976,1-4; 15.1977 - 28.1990,2; 29.1991,2-3; 30.1992,2; 31.1993,2-4; 32.1994,1u.2u.4; 33.1995 - 44.2006