How to use get_terms to show only published posts?

I need to display a list of taxonomy terms, but only those which have posts with status “published”. ie: if a term has no publicly available posts, then I don’t want it displayed. I am using get_terms() and it is displaying *all* terms in the taxonomy — even terms that only have “private” or “draft” or “pending review” posts.

Here is some sample code:

$regions = get_terms("region");
foreach ( $regions as $region) {
    echo "<li>" . $region->name . " : ". $region->slug ."</li>
";
}

Can someone suggest how I can modify this code to bring up only the taxonomy terms will published posts??