The Senedd building opens in Cardiff Bay in 2006
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Welsh Assembly election: A history of devolution

Polling day for the fifth Welsh Assembly elections will take place on 5 May.

First held in May 1999, Labour has been returned each time as the biggest party and has gone on to form the government.

They have not always been in sole charge - at times they have had to share power with the Liberal Democrats and Plaid Cymru.

BBC Wales political correspondent Arwyn Jones takes a look back at 17 years of elections and post-poll wrangling in Cardiff Bay.