（单位：美元/吨）
       时间        美湾      阿根廷
    07/08/2010    49.78      51.2
    07/07/2010    55.87      55.8
    07/06/2010    55.87      55.8
    07/05/2010    55.87      55.8
    07/02/2010    57.32      56.62
    07/01/2010    59.21      57.67
    06/30/2010    60.8       59.08
    06/29/2010    60.8       59.9
    06/28/2010    60.8       59.9
    06/25/2010    60.8       57.44
    06/24/2010    60.8       57.44
    06/23/2010    59.64      59.9
    06/22/2010    60.22      59.9
    06/21/2010    61.38      59.9
    06/18/2010    61.38      59.9
    06/17/2010    64.86      65.65
    06/16/2010    67.77      65.65
    06/15/2010    67.77      65.65
    06/14/2010    67.77      65.65
    06/11/2010    67.77      65.65
    06/10/2010    68.93      66.06
    06/09/2010    70.09      66.47
    06/08/2010    70.09      66.47
    06/07/2010    70.67      67.29
    06/04/2010    75.88      73.76
    06/03/2010    75.88      73.76
    06/02/2010    75.88      73.76
    05/31/2010    75.88      73.76
    05/28/2010    75.88      73.76
    05/27/2010    77.05      75.51
    05/26/2010    77.05      77.94
    05/25/2010    77.05      76.33
    05/21/2010    75.6       79.58
    05/20/2010    75.6       79.58

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