[EARTH graphic][EARTH graphic]

Ronald Mitchell's Website

Data analysis results

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    ORIGINAL DATA

    Year
    Column ozone (in Dobson units)
    Policy change
    1979
    209
     
    1980
    205
     
    1981
    205
     
    1982
    189
     
    1983
    169
     
    1984
    154
     
    1985
    146
     
    1986
    159
     
    1987
    120
    Montreal Protocol signed
    1988
    173
     
    1989
    124
     
    1990
    128
     
    1991
    117
     
    1992
    124
     
    1993
    94
     
    1994
    88
     
    1996
    111
     
    1997
    104
     

    SUMMARY STATISTICS

    Period
    Average Annual Level
    Average Rate of Change
    1979 through 1987
    172.8 Dobson units
    -11.1 Dobson units per year
    1988 through 1997
    118.1 Dobson units
    -8.62 Dobson units per year

    This graph and data were produced using Simple Graph & Data Software designed by Ronald B. Mitchell © 1998 rmitchel@uoregon.edu based on the PGPLOT Perl module designed by Karl Glazebrook kgb@aaoepp.aao.gov.au

    This page created by:
    Ronald Mitchell - rmitchel@uoregon.edu
    Department of Political Science - http://pages.uoregon.edu/rmitchel
    University of Oregon, Eugene, OR 97403-1284
    Tel: 541-346-4880 - Fax: 541-346-4860
    İRonald Mitchell, 1998-2008