Echo page version

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Hi guys,

I'm trying to make a footer which shows the date, author and version of a page. The date and author are done but I can't find a way to echo the current page version.

I found a way to display total versions but I want it per page. Code for total version:
<?php Loader::model('page_statistics');
echo PageStatistics::getTotalPageVersions();
?>

Does anyone know a solution to echo the current page version? Thanks!