year mo    data_type region extent   area
1979  9      Goddard      S  18.40  14.18
1980  9      Goddard      S  19.06  14.77
1981  9      Goddard      S  18.90  14.68
1982  9      Goddard      S  18.63  14.44
1983  9      Goddard      S  18.84  14.59
1984  9      Goddard      S  18.66  14.15
1985  9      Goddard      S  19.02  14.62
1986  9      Goddard      S  17.97  13.78
1987  9      Goddard      S  18.65  14.18
1988  9      Goddard      S  18.64  14.10
1989  9      Goddard      S  18.27  14.39
1990  9      Goddard      S  18.44  14.30
1991  9      Goddard      S  18.56  14.38
1992  9      Goddard      S  18.41  14.04
1993  9      Goddard      S  18.67  14.62
1994  9      Goddard      S  18.96  14.52
1995  9      Goddard      S  18.73  14.42
1996  9      Goddard      S  18.86  14.45
1997  9      Goddard      S  19.15  14.49
1998  9      Goddard      S  19.14  14.76
1999  9      Goddard      S  19.02  14.53
2000  9      Goddard      S  19.12  14.98
2001  9      Goddard      S  18.40  14.27
2002  9      Goddard      S  18.18  14.00
2003  9      Goddard      S  18.57  14.05
2004  9      Goddard      S  19.13  14.51
2005  9      Goddard      S  19.14  14.76
2006  9      Goddard      S  19.36  15.09
2007  9      Goddard      S  19.25  15.29
2008  9      Goddard      S  18.50  14.31
2009  9      Goddard      S  19.20  14.99
2010  9      Goddard      S  19.22  14.32
2011  9      NRTSI-G      S  18.90  14.38

 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.