Dark chocolate percentages

On the web page (
http://www.finedarkchocolate.com/Chocolate/Luker_1906/Luker_1906_Tu...) for "1906" Tumaco dark chocolate, the following two statements are made:

    Minimum 53% cocoa content.

and

    Luker 1906 Tumaco Extra Dark Chocolate 85%.

So is it 85% cocoa or "minimum 53% cocoa content"?  And Just what does "Dark Chocolate 85%" mean?

Thank you.