The related infographic linked below this one showing price and purity doesn't have any units, I'd assume percentage for purity yet it goes above 160... Not sure what to make of this. Is it garbage or am I missing something?
Assuming you are talking about [0], the graph looks as if the value of 2009 was taken as reference point and percentages are calculated relative to that. You could look it up in [1] where the graphics seems to be taken from.
https://en.wikipedia.org/wiki/List_of_busiest_ports_in_Europ...