year mo    data_type region extent   area
1979  3      Goddard      S   4.47   2.57
1980  3      Goddard      S   3.54   2.04
1981  3      Goddard      S   3.66   2.08
1982  3      Goddard      S   4.80   2.75
1983  3      Goddard      S   4.32   2.54
1984  3      Goddard      S   3.93   2.27
1985  3      Goddard      S   3.99   2.47
1986  3      Goddard      S   4.08   2.31
1987  3      Goddard      S   4.42   2.67
1988  3      Goddard      S   4.35   2.54
1989  3      Goddard      S   4.19   2.52
1990  3      Goddard      S   4.36   2.71
1991  3      Goddard      S   4.33   2.54
1992  3      Goddard      S   4.07   2.39
1993  3      Goddard      S   4.18   2.15
1994  3      Goddard      S   5.07   3.13
1995  3      Goddard      S   4.97   2.94
1996  3      Goddard      S   4.61   2.56
1997  3      Goddard      S   3.85   2.23
1998  3      Goddard      S   4.65   2.64
1999  3      Goddard      S   4.53   2.51
2000  3      Goddard      S   4.43   2.60
2001  3      Goddard      S   5.07   3.30
2002  3      Goddard      S   3.94   2.29
2003  3      Goddard      S   4.81   3.16
2004  3      Goddard      S   4.81   3.10
2005  3      Goddard      S   4.47   2.66
2006  3      Goddard      S   3.44   1.94
2007  3      Goddard      S   4.09   2.48
2008  3      Goddard      S   5.74   3.61
2009  3      Goddard      S   4.96   2.94
2010  3      Goddard      S   4.03   2.60
2011  3      NRTSI-G      S   3.61   2.18

 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.