Share '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.