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Concentration(ppb) <br /> _ 0 <br /> 0 O <br /> 1 p O O 0 0 <br /> 10/111987 <br /> 212/1988 - <br /> 6/24/1988 - <br /> 1/18/1989 - <br /> 10/12/1989 <br /> /2/19886/24/19881/18/198910/12/1989 <br /> 3/13/1991 <br /> 3/16/1992 - <br /> 6/2/1992 - <br /> 12115/1992 <br /> /16/19926/21199212/15/1992 <br /> 3/1211993 - <br /> 613011993 - <br /> 813111993 - <br /> 1211611993 <br /> /12/19936/30/19938/31/199312/16/1993 <br /> 4/29/1994- <br /> 9/27/1994- n <br /> 7/27/1995 7 <br /> 1111611996 C m <br /> 2/7/1996 N p' <br /> 5/21/1996 rn = <br /> N 8/28/1996 N <br /> m a 12/30/1996 C <br /> �E @ 2/21/1997 - m <br /> I 5/9/1997 (D <br /> = 8/14/1997 <br /> I11/6/1997 <br /> 2/13/1998 <br /> 5/19/1998 I <br /> 8/6/1998 <br /> 1 1/511 998 <br /> 2/24/1999 <br /> 5/11/1999 <br /> 8/10/1999 <br /> 11/811999 I <br /> 2/8/2000 <br /> 5/212000 - <br /> 811012000 - <br /> 1111412000 <br /> /2/2000 8/10/20001111412000 <br /> 2/9/2001 ' <br /> 5/22/2001 <br /> 8/6/2001 <br /> 11/9/2001 ' <br />