This chart includes estimates for one or more groups that are too small to be statistically reliable, interpret with caution.
View flagged groups
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Mar 2015 - May 2015:
'Plaid Cymru', 'British National Party (BNP)', 'Other party'
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Jun 2016 - Jul 2016:
'Plaid Cymru', 'Green Party'
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Nov 2016 - Dec 2016:
'Plaid Cymru', 'Other party'
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Apr 2017 - May 2017:
'Plaid Cymru', 'Other party'
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May 2017 - Jun 2017:
'Plaid Cymru', 'Other party'
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Jun 2017 - Jun 2017:
'Scottish National Party (SNP)', 'Plaid Cymru', 'Green Party', 'Other party'
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May 2018 - May 2018:
'Plaid Cymru', 'Other party'