You can value them according to Google keyword searches per month.
For example:
Take www.kyb.in
keyword= kyb
Global monthly searches= 301000
Local monthly searches at following country
India= 1600
US= 74000
UK= 33100
Japan=33100
Germany=12100
Australia=6600
China=4400
Brazil=1900
I don’t have other countries report as there are so many countries.