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<br /> Seven Western Rivers Index <br /> Water Years 1900-2002 <br /> '7'0 <br /> 140 I--AMO-l1 +AMO II -AMO --;1- <br /> . 130 1940 <br />1-' : 1941..... <br /> -: 120 EI Nino <br /> ~ ' <br />,..... 110 <br /> , 100 <br /> - <br /> 90 1988 I <br /> 1989 <br /> 80 La Nina <br /> 70 <br /> 1900 1920 1940 1960 1980 2000 <br /> <br /> <br /> <br />Courtesy of Henry Diaz, NOAA <br /> <br />~USGS <br /> <br />SCHmCft for . changing world <br />