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<br />------------------- <br /> <br />Q) <br />N 600 <br />.- <br /> <br />en 500 <br />C <br />o 400 <br /> <br />CO 300 <br /> <br />:::J 200 <br />0. <br />o 100 <br />a... <br /> <br />Dsub-adults <br />500 -- <br />~adults <br /> <br />100 <br /> <br /> <br />400 -- <br />300 <br />200 <br /> <br />o <br />700 <br /> <br />Lower reach <br /> <br />600 <br /> <br /> <br />o <br />1000 <br />800 - W~~I~ riY_~r {~I)r11-'TI~~l_ - - - - - - - -- <br /> <br />400 <br /> <br />200 <br /> <br />o <br /> <br />91 92 93 94 <br />Year <br /> <br />98 99 0 <br />