It depends on the country your talking about. For the United States, below the population of United States.
68% of voters voted in 2008 (At least for president). That number will be hard to match in the coming years.
Over 2.0 voted this year .2012
Over 200,000,000 voted (including voted twice or more )
Exact figures are unknown.
Exact figures are not known.
1.9 million people voted
Depends on how many people voted for it.
Brack Obama got 37% voted from people and Mitt Romey got 40% voted from people+
there are 20 billions of people voted that specific
65,899,660
59% of the population voted in 2008.
About 71% voted this year
65,899,660