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<br />~~ t~L V ~ ~ ~ ~~~~~ ~~~1'~ <br />~~'U''U 1 V ~~~~~ ~'ll1 V JL~ <br /> <br />ca <br />z <br />0 <br /> <br />60 <br />50 <br />40 <br /> <br />20 <br />10 <br />0 <br />---~- <br />VvF11 1 <br />----~-- <br />Wa.L 1 A <br />Wl-1.L 1 B <br />WE7J_ 1 C <br />WF-7_l.. 7 <br />SPMPI~NG PERIOD <br />1984 1985 1986 1987 1988 1989 <br />