Number of measurements available in each month during the year of 1997-2002

Location Month 1997 1998 1999 2000 2001 2002
SPOK1 1 0 0 0 0 0 9
SPOK1 2 0 0 0 0 0 10
SPOK1 3 0 0 0 0 0 9
SPOK1 4 0 0 0 0 0 10
SPOK1 5 0 0 0 0 0 10
SPOK1 6 0 0 0 0 0 10
SPOK1 7 0 0 0 0 0 11
SPOK1 8 0 0 0 0 0 9
SPOK1 9 0 0 0 0 2 7
SPOK1 10 0 0 0 0 8 9
SPOK1 11 0 0 0 0 6 9
SPOK1 12 0 0 0 0 10 4