Year	Begin	End	Year	Begin	End
1948	Jun. 1,  0 h	Sept. 13,  0 h	1957	May 5,  0 h	Sept. 22,  0 h
1949	Apr. 3,  0 h	Sept. 11,  0 h	1958	May 4,  0 h	Sept. 21,  0 h
1950	Apr. 1,  0 h	Sept. 11,  0 h	1959	May 3,  0 h	Sept. 20,  0 h
1951	May 6	Sept.   8	1960	May 1,   0 h	Sept. 18,  0 h
1955	May 5	Sept.   8	1987	May 10,  02 h	Oct.   11,  03 h
1956	May 20	Sept. 29	1988	May   8,  02 h	Oct.   9,   03 h