Convert to the one true date format of yyyy-mm-dd and just use the default sort:

foreach( keys %totals ) {
    $totals{$_}= "20" . join "-",(
      split m#/#, delete $totals{$_}
    )[2,0,1];
}
[download]

and thank vroom that the y2k thing finally blew over so you don't have to do that 2-digit-to-4-digit year conversion thing the "proper" way anymore.

update: got the one true date format wrong the first time... i'm so ashamed...

        - tye (and not even my friends are sure when I'm joking)

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