I need to know voter participation rates in Japan in a national
parlimentary election some time from 1996 to the present by age.  The
more elections the better.  The age-specific rates that I need are of
the form: number of voters 20 to 25 years old divided by the
population 20 to 25 years old.  I need these ratios for all age groups
from the earliest age at voting upward.  The ratios can be in 10 year
age groups as well.  I would also accept ratios of the form: number of
voters 20-25/people eligible to vote who are 20-25.
A table could look like this:
Age Group            People Who Voted                   People Eligible to Vote 
                                               or Population in Age   
Group
18-25                        100                              150
26-35                        90                               140
...
75 and over                  20                                30

It is ok if the table just has the above form without the ratios being
explicitly computed.  I can compute the ratios myself.

Thanks.