1- 1978
2- 1980
3- 1980
 4- May 1980
 5- Oct. 1980
 6- Oct. 1980
7- 1981
 8- 1981
 9- 1981
 10- June 1981
11- Sept. 1981
 12- Sept. 1981
 13- Sept. 1981
14- Sept. 1981
 15- Sept. 1981
 16- Sept. 1981
 17- Oct. 1981
 18- Nov. 1981
19- Nov. 1981
 20- Nov. 1982
21- Oct. 1984
22- Dec. 1987
23- July 1991
24- April 1993
25- March 1995