id,polling_on,is_notional,commons_library_briefing_url,valid_vote_count,invalid_vote_count,electorate_population_count,parliament_period_id
1,2010-05-06,0,https://commonslibrary.parliament.uk/research-briefings/rp10-36/,29687604,81879,45597461,55
2,2015-05-07,0,https://commonslibrary.parliament.uk/research-briefings/cbp-7186/,30697525,102639,46354197,56
3,2017-06-08,0,https://commonslibrary.parliament.uk/research-briefings/cbp-7979/,32204184,74188,46836533,57
4,2019-12-12,0,https://commonslibrary.parliament.uk/research-briefings/cbp-8749/,32014110,117919,47562702,58
5,2019-12-12,1,,32014119,0,47558398,58
6,2024-07-04,0,,,,,59