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** Source: J.W. Elkins, T.M. Thompson, J.H. Butler, S.A. Montzka, R.C. Myers  **
**         National Oceanic and Atmospheric Administration                    **
**         Boulder, Colorado, U.S.A.                                          **
**                                                                            **
**         A.D. Clarke, T.H. Swanson                                          **
**         University of Colorado (CIRES)                                     **
**         Boulder, Colorado, U.S.A.                                          **
**                                                                            **
**         D.J. Endres                                                        **
**         National Oceanic and Atmospheric Administration                    **
**         Point Barrow Observatory, Barrow, Alaska, U.S.A.                   **
**                                                                            **
**         A.M. Yoshinaga, R.C. Schnell                                       **
**         National Oceanic and Atmospheric Administration                    **
**         Mauna Loa Observatory, Hilo, Hawaii, U.S.A.                        **
**                                                                            **
**         M. Winey                                                           **
**         National Oceanic and Atmospheric Administration                    **
**         Samoa Observatory, Pago Pago, American Samoa, U.S.A.               **
**                                                                            **
**         B.G. Mendonca                                                      **
**         National Oceanic and Atmospheric Administration                    **
**         South Pole Observatory, c/o Boulder, Colorado, U.S.A.              **
**                                                                            **
**         M.V. Losleben                                                      **
**         University of Colorado                                             **
**         Mountain Research Station, Nederland, Colorado, U.S.A.             **
**                                                                            **
**         N.B.A. Trivett, D.E.J. Worthy, V. Hudec, V. Chorney                **
**         Atmospheric Environment Service                                    **
**         Downsview, Ontario, Canada                                         **
**                                                                            **
**         P.J. Fraser                                                        **
**         Commonwealth Scientific and Industrial Research Organisation       **
**         Aspendale, Victoria, Australia                                     **
**                                                                            **
**         L.W. Porter                                                        **
**         Cape Grim Baseline Air Pollution Station                           **
**         Smithton, Tasmania, Australia                                      **
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1991.8712  110.2   1991.359   2.23   1991.359   2.44
1992.0519  110.0   1991.529   1.77   1991.529   1.91
1992.1284  109.5   1991.759   1.89   1991.759   2.27
1992.3279  110.5   1991.874   1.92   1991.874  -9.99
1992.3852  113.4   1992.131   1.99   1992.131   2.65
1992.6202  111.5                                    
1992.7131  112.1                                    
1992.9071  115.0