The first and last sentences in the graphic you posted are entirely inaccurate. The vote was whether or not to adopt the euro as their currency; not to leave the European union. Sweden never adopted the euro. They voted against it. Their currency is, and has been the Swedish Krona. Very easily verifiable.
Let's not adopt the habits of our leftist opponents who take everything they see on the internet at face value and run with it as long as it fits their narrative.