year mo    data_type region extent   area
1979  4      Goddard      S   8.21   5.36
1980  4      Goddard      S   5.93   3.58
1981  4      Goddard      S   6.31   3.98
1982  4      Goddard      S   8.28   5.71
1983  4      Goddard      S   7.09   4.60
1984  4      Goddard      S   7.02   4.44
1985  4      Goddard      S   7.05   4.66
1986  4      Goddard      S   6.91   4.48
1987  4      Goddard      S   7.36   4.96
1988  4      Goddard      S   6.85   4.36
1989  4      Goddard      S   6.85   4.42
1990  4      Goddard      S   7.48   5.10
1991  4      Goddard      S   7.49   5.10
1992  4      Goddard      S   7.42   4.91
1993  4      Goddard      S   7.18   4.82
1994  4      Goddard      S   7.67   5.38
1995  4      Goddard      S   7.78   5.33
1996  4      Goddard      S   7.99   5.28
1997  4      Goddard      S   7.09   4.76
1998  4      Goddard      S   7.56   5.03
1999  4      Goddard      S   7.33   5.05
2000  4      Goddard      S   7.77   5.23
2001  4      Goddard      S   7.52   5.22
2002  4      Goddard      S   6.99   4.49
2003  4      Goddard      S   7.77   5.48
2004  4      Goddard      S   7.79   5.33
2005  4      Goddard      S   7.50   5.12
2006  4      Goddard      S   6.57   4.20
2007  4      Goddard      S   7.01   4.62
2008  4      Goddard      S   8.68   6.15
2009  4      Goddard      S   8.36   5.88
2010  4      Goddard      S   7.31   4.92
2011  4      NRTSI-G      S   6.74   4.27

 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.