To be fair the only countries that are ever realistically going to leave the EU are those that:
1, have their own currency.
2, have strong relationships with countries outside of the EU.
Both of this applies to Denmark and Sweden, and for Sweden, where workers rights organically are much stronger than the UK and the EU has actually served to undermine those rights I'd be in full support for a Swexit. We have our own currency and our strongest European ally outside of the Nordics (the UK) is leaving so the EU is completely against the national interest right now save for the wining and dining elitist politicians who could care less about left-behind rural counties like mine. They only care about the large cities
They'll never give us a vote though but our referendum on the Euro in 2003 serves as a guideline for what would happen. It ended 61-39 for the Swedish krona. Granted support for EU membership would be higher but I believe Swexit would win with a larger margin than in the UK to be honest, it wouldn't happen prior to Brexit, but now I'm sure it would.
Sometime around 2004 they stopped doing opinion polling on EU membership here, wonder why? Well they all know in the establishment that Sweden is the most eurosceptic nation on the continent, that's why
They quelled the debate and put a hush-hush on how the EU allowed for wage-dumping and the crushing of unions in Sweden.
In Sweden, the interesting thing is that it's largely equal between left and right-leaning voters regarding euroscepticism. There's not any particular right-wing bias towards it.