STOCKHOLM, Sept 17 - When the far-right anti-immigrant Sweden Democrats won a record one-fifth of the vote in a 2022 election, Viking rock player and party leader Jimmie Akesson led supporters in an impromptu celebratory conga.On Sunday, the dance floor was largely empty.Instead, party veterans at their hotel HQ near Stockholm's city centre sombrely absorbed something they had never seen before: a decline in support at a parliamentary vote."We knew there was always a chance that we would be punished after these four years of (government) cooperation, but I didn't think the drop would be this big," party veteran Richard...