Compulsory voting
Compulsory voting is an effect of laws which require eligible citizens to register and vote in elections, and may impose penalties on those who fail to do so. , 22 countries provide for compulsory voting, and 11 democracies — about 5% of all United Nations members — enforce it.
Voter suppression
In Australia, it is mandatory for citizens to enroll to vote and it is their responsibility to update their enrollment when they change their address. Even so, it is estimated that about 6% of eligible Australian voters are not enrolled, or are enrolled incorrectly. These are disproportionately younger voters, many of whom might neglect to enroll when they attain voting age.