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