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1979 <br />1980 <br />O <br />NITRATE/NITRITE <br />U <br />O <br />as N <br />u <br />(mg/1) <br />O U <br />O <br />O <br />1979 <br />N <br />O <br />N <br />1981 <br />N <br />O 8� <br />O <br />1982 <br />1980 <br />1983 <br />, <br />1981 <br />1984 <br />• <br />■ <br />■ <br />1985 <br />■ <br />1983 <br />1986 <br />■ <br />1987 <br />1988 <br />■ ■ <br />1986 <br />1989- <br />1987 <br />1990 <br />• <br />1988 <br />1991 <br />■ <br />1989 <br />.-J <br />M <br />1992 <br />■ <br />Z <br />1993 <br />p <br />994 <br />1994- <br />1992 <br />1993 <br />O <br />01995. <br />■ <br />M <br />1994 <br />Z <br />Z 1995 <br />-1 1996 <br />-1 1996 <br />O <br />O�q <br />°u 1997 <br />N WG <br />°? <br />, <br />p <br />1990 <br />y 19990c <br />1997 <br />Z <br />M 2000 <br />■ <br />C) 1998 <br />2001 <br />0 1999 <br />■ <br />, <br />a <br />2003 <br />m <br />M 2000 <br />2004 <br />c <br />sU <br />2001 <br />CD <br />Z <br />0 <br />2005- <br />oos <br />Cl. O\ <br />002 <br />2002- <br />2006 <br />2006- <br />CD <br />2003a <br />2003- <br />■ <br />2008 <br />ca. <br />2004- <br />004 <br />2009 <br />2005- <br />2005ru <br />5 <br />2010. <br />�. <br />2011 <br />CD <br />006 <br />2006- <br />2012- <br />012 <br />2007- <br />2007200820092010 <br />20 1 3 <br />2013 <br />2008- <br />2009- <br />2015 <br />2010 <br />2018 <br />- <br />z z <br />2011- <br />0112012 <br />- <br />2012- <br />2013-- <br />2013 <br />2014- <br />2014 <br />2015- <br />2015 <br />-- <br />--- <br />-- - <br />- - <br />2016 <br />-- <br />- - <br />- - <br />- - <br />--- - - - -- <br />NITROGEN, <br />Ammonia <br />(mg/1) <br />O <br />1979 <br />N <br />O <br />N <br />O <br />N <br />O 8� <br />O <br />1980 <br />1981 <br />1982 <br />1983 <br />1984 <br />1985 <br />1986 <br />1987 <br />1988 <br />1989 <br />1990 <br />Z <br />1991 <br />—J <br />1992 <br />1993 <br />■ <br />M <br />1994 <br />Z <br />Z 1995 <br />-1 1996 <br />O <br />O�q <br />°u 1997 <br />p <br />1990 <br />y 19990c <br />w• — <br />M 2000 <br />W C <br />2001 <br />O� <br />2002 <br />a <br />2003 <br />2004 <br />CD <br />Z <br />0 <br />2005- <br />oos <br />2006 <br />2006- <br />CD <br />2007 <br />■ <br />2008 <br />z z <br />5 <br />2009 <br />5 <br />2010. <br />�. <br />2011 <br />2012- <br />012 <br />20 1 3 <br />2013 <br />2014 <br />2015 <br />2018 <br />