Holdings
13.1970,1u.16u.19; 14.1971,7-10; 15.1972,17-18; 17.1974,17-19u.21u.24-25; 18.1975,15u.20-21u.23; 19.1976,2-3/4u.6u.14-18u.21; 20.1977,4u.7u.9-15u.17u.22-24; 21.1978,1-7u.9u.19u.23-24; 22.1979,5; 23.1980,9u.16-18u.21u.24-26; 24.1981,1-3u.7-8u.10-13u.17-19u.22u.23-24u.26; 25.1982,1-2u.5-26; 26.1983,1-5u.7-9u.11-26; 27.1984,1-9u.11-26; 28.1985,1-10u.12-18u.20-26; 29.1986,1-3u.8/9u.15u.17u.24.; 30.1987,1u.17-22; 33.1990,16-17