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Concentration(ppb) <br /> i W <br /> a <br /> 10/1/1987 <br /> 4/1/1988 <br /> 10/1/1988 <br /> 4/1/1989 <br /> 10/1/1989 <br /> 411/1990 <br /> 10/l/1990 <br /> 4/l/1991 <br /> 10/1/1991 <br /> 4/l/1992 <br /> 10/l/1992 <br /> 4/1/1993 n <br /> O <br /> 10/1/1993 c3, <br /> O m <br /> 4/1/1994 <br /> m y <br /> m 10/l/1994 - O • <br /> w <br /> m p 4/l/1995 N <br /> ro O <br /> 10/l/1995 r <br /> i w <br /> 4/1/1996 <br /> w <br /> 10/l/1996 <br /> 4/1/1997 ) <br /> 10/111997 <br /> 411/1998 - <br /> 10/111998 <br /> 11/199810/111998 <br /> 4/l/1999 <br /> 10/1/1999 <br /> 41112000 <br /> 10/l/2000 <br /> 411/2001 <br /> 10/l/2001 <br /> 4/1/2002 <br /> 10/1/2002 , <br />