Hi experts,

I have a table of regions with currency amounts against each region. I wish
to thematically map the ratio of the currency amount for each region to the
average (currency amount) for all regions.  The averages are not recorded
in the table.

What is the elegant way of doing this.

example

Data as it is
Region Name    Euros
Smithboro 12
Jonesville     10
Someplace 8

with the above data I would be seeking to thematically represent values of

Region Name    Ratio
Smithboro 12/((12+10+8)/3)
Jonesville     10/((12+10+8)/3)
Someplace 8/((12+10+8)/3)

i.e

Region Name    Ratio
Smithboro 1.2
Jonesville     1.0
Someplace 0.8


Regards
Brendan O'Donovan Snr Exploration Geologist Outokumpu Tara Mines Ireland.



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