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.

• News translation task submissions, and human evaluation data. Also, there is source-based human evaluation data (coming soon).
• Metrics task data: submissions and scripts to reproduce the results published in the metrics task paper
• Biomedical task (coming soon)
• Automatic post-editing task: data, submissions, results
• Multimodal task (results data unavailable)
• Quality estimation task: results, gold labels, submissions and baseline predictions.
• Parallel corpus filtering shared task: submissions and scores

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