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<br />e <br /> <br />e <br /> <br />,.. <br /> <br />, , <br /> <br />. <br /> <br />POPULATION BY RING <br />TWIN CITIES METROPOLITAN AREA <br />1940-1990 <br /> <br />Thousands <br />1000 <br /> <br />'"" <br /> <br />800 <br /> <br /> <br /> <br />, , <br /> <br />, <br />, <br />, <br />, <br />, <br />, <br />, <br />, <br />, <br />, <br />, <br /> <br />600 <br /> <br />, <br />, <br /> <br />..+ <br /> <br />" <br /> <br />...~...... <br /> <br />" <br /> <br />*" <br /> <br />400 <br /> <br />,..... <br />.::1 <br /> <br />200 <br /> <br />, <br /> <br />, <br />, <br />, <br />, <br />--*' <br /> <br /> <br />-.' <br />.,,' <br />_..~-~~----~~ <br />..--..- <br /> <br />t............ <br />o <br />1940 <br /> <br />I.... <br />"..-'-''''1 <br /> <br />" <br /> <br />" <br /> <br />1950 <br /> <br />1960 <br /> <br />1970 <br /> <br />1980 . <br /> <br />I <br />1990 <br /> <br />Year <br /> <br />- <br /> <br />Outer Ring <br /> <br />-1- Inner Ring <br />-S- Central Cities <br /> <br />..*-- Middle Ring <br /> <br />11 <br />