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For reference, informal votes were around 5% in our last federal election:

https://results.aec.gov.au/27966/website/HouseInformalByStat...

This article contains a fun breakdown of the types of informal votes including a category for "the usual anatomical drawings" (0.7% of informal votes):

https://www.crikey.com.au/2025/04/22/2025-federal-election-p...

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You can't bring them up without including that voting is compulsory there.
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See my sibling comment. Getting your name checked off is compulsory but nothing stops you from handing in a blank ballot.
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For the purposes of this comparison, those "informal" votes still count in the typically used participation statistics. Voters intentionally case "wasted" ballots in other countries too.
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Why would you hand blank ballot at. That point? You might as well vote.
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"I don't like any of the rat-bastards." "I don't care." "I think it's funnier to draw a dick. (And I don't care.)" "I trust other people to make the right choice." "I refuse to participate in this bourgeois sham election." ...are all reasons I've heard, even if I don't actually understand any of them.
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