'Importing attribute data with ImportXML google sheets

I have attempted to import price data from this site:

http://runescape.wikia.com/wiki/Rubber_turkey#

with this import xml code:

=IMPORTXML("http://runescape.wikia.com/wiki/"&SUBSTITUTE(A3," ","_")&"#", "//div[@class='GEChartBox']/div/@data-data")

where A3 is

Rubber turkey

but it says the imported content is empty, what am I doing wrong here?

Its the value contained in the data-data attribute of the div



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