Availability of 1-min Data for 1991 
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1991    JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 
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CKA                             *** #*- *#* #** ###
MIR     #*# *--
MOS     ### ### -*# ### ##* ##* ### ### ##* ### ### ###
SEY     *** -*- **-     -** **- -*# *-* *** -** #** *#*
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  "-" - No data;    "*" - gaps;    "#" - complete;