year mo    data_type region extent   area
1979  5      Goddard      S  11.43   8.19
1980  5      Goddard      S   9.46   6.34
1981  5      Goddard      S  10.11   6.97
1982  5      Goddard      S  11.16   8.18
1983  5      Goddard      S  10.09   7.06
1984  5      Goddard      S  10.38   7.33
1985  5      Goddard      S  10.86   7.74
1986  5      Goddard      S   9.78   6.97
1987  5      Goddard      S  10.28   7.45
1988  5      Goddard      S  10.32   7.13
1989  5      Goddard      S  11.17   7.91
1990  5      Goddard      S  10.34   7.37
1991  5      Goddard      S  11.08   7.77
1992  5      Goddard      S  10.37   7.53
1993  5      Goddard      S  10.59   7.80
1994  5      Goddard      S  10.95   8.12
1995  5      Goddard      S  11.11   8.23
1996  5      Goddard      S  11.50   8.57
1997  5      Goddard      S  10.84   7.82
1998  5      Goddard      S  10.92   7.82
1999  5      Goddard      S  10.89   7.99
2000  5      Goddard      S  11.66   8.47
2001  5      Goddard      S  10.96   7.92
2002  5      Goddard      S   9.98   7.09
2003  5      Goddard      S  11.38   8.35
2004  5      Goddard      S  10.95   8.09
2005  5      Goddard      S  10.97   7.87
2006  5      Goddard      S  10.18   7.08
2007  5      Goddard      S  10.34   7.44
2008  5      Goddard      S  11.51   8.51
2009  5      Goddard      S  11.43   8.37
2010  5      Goddard      S  11.51   8.24
2011  5      NRTSI-G      S  10.82   7.71

 Important Note: 

 When insufficient satellite data is available to process the area and extent
 values, the data is flagged as -9999. For more information see Processing
 Steps, Monthly Mean Ice Concentration in the documentation -
 http://nsidc.org/data/docs/noaa/g02135_seaice_index/index.html#processingstep.