Click here to see the SAS code.
Click here to see the example.

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This is similar to the following U.N. map:
http://esa.un.org/unup/Maps/maps_1970_2011.htm

One improvement is that mine has html mouse-over text for the cities.


Got data from here:
http://esa.un.org/unup/CD-ROM/WUP2011-F12-Cities_Over_750K.xls


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