i d b means i don't know
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The best estimate can be found at http://www.census.gov/ipc/www/idb/country/rpportal.html
it has decreased go to http://www.census.gov/ipc/www/idb/country.php
situated
Both are correct, but "situated in the center" is slightly more common.
It is situated in London
The city was situated on the bay.
it is situated at Sarnath
it is situated at Sarnath
According to the projections of the U.S. Census Bureau (http://www.census.gov/ipc/www/idb/worldpop.html), the world's population will surpass 7 billion in 2012.
i do not know but it was situated in or with napolen on his march