The results of the shared task are summarized in the paper:

Findings of the 2018 Conference on Machine Translation
Ondřej Bojar, Christian Federmann, Mark Fishel, Yvette Graham, Barry Haddow, Matthias Huck, Philipp Koehn and Christof Monz
pdf, bib.

The raw data is available here.

You can also download the past raw data from WMT07, WMT08, WMT09, WMT10, WMT11, WMT12, WMT13, WMT14, WMT15, WMT16 and WMT17.