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Concentration(ppb) <br /> o <br /> b O O b <br /> 1011/1987 - <br /> 2/211988 <br /> 612411988 - <br /> 1118/1989 - <br /> 1011211989 <br /> /24/19881/18/198910/12/1989 <br /> 12/1311990 <br /> 3/13/1991 <br /> 611 711 99 1 <br /> 3/16/1992 <br /> 6/2/1992 n <br /> � � n <br /> 9/17/1992 o cn <br /> m 1 211 5/1 992 p* <br /> • <br /> Z <br /> 3/12/1993 - <br /> 613011993 - <br /> 8/31/1993 - <br /> 12/16/1993 <br /> /12/1993 6/30/199381311199312/16/1993 <br /> 4/2911994 - <br /> 9/2711994 - <br /> 7/27/1995 <br /> /29/19949/27/19947/27/1995 <br /> 11/16/1995 <br /> 12/30/1996 <br /> 611311997 - <br /> 8/611998 - <br /> 8110/1999 - <br /> 8110/2000 - <br /> /13/19978/6/19988/10/1999 s/1a2000 <br /> 8/6/2001 <br />