May 3, 1975
June 1, 1975
June 3, 1975
August 7, 1975
June 22, 1976
June 16, 1977
October 13, 1977
December 17, 1977
April 19, 1978
September 18, 1978
October 9, 1978
October 23, 1978
April 19, 1980
July 16, 1980
July 25, 1981
June 27, 1982
August 11, 1983
September 27, 1984
October 21, 1984
December 30, 1984
June 21, 1985
August 5, 1985
May 21, 1986
July 9, 1986
October 26, 1986
March 23, 1987
January 17, 1988
January 31, 1988
May 12, 1988
July 10, 1988
July 10, 1988
August 19, 1988
September 4, 1988
June 5, 1989
July 12, 1989
July 18, 1989
October 21, 1989
April 24, 1990
July 11, 1990
November 5, 1990
December 19, 1990
February 17, 1991
June 22, 1991
June 28, 1991
July 6, 1991
October 17, 1991
June 14, 1992
June 22, 1992
July 15, 1992
July 27, 1992
July 29, 1992
September 15, 1992
March 28, 1993
April 15, 1993
September 23, 1993
August 19, 1994
August 22, 1994
September 23, 1994
January 3, 1995
May 11 to August 1995
June 26, 1995
September 3, 1995
August 22, 1996
August 23, 1996
August 31, 1996
September 2, 1996
March 21, 1997
April 10, 1998
August 3, 1998
June 11, 1999
November 17, 1999
December 12, 2000
June 16, 2001
September 5, 2001
November 2, 2001
April 3, 2003
June 5, 2002
July 22, 2002
July 26, 2002
August 8, 2002
September 24, 2002
September 28, 2002
November 5, 2002
November 9, 2002
April 23, 2003
May 22, 2003
June 3, 2003
June 22, 2003
July 29, 2003
April 22, 2004
May 12, 2004
April 21, 2005
May 18, 2005
August 28, 2005
October 8, 2005
October 27, 2006
April 18, 2007
August 15, 2008
September 11 , 2008