This [Sweden's Migration Agency] trend has continued in 2017 and 1,718 applications have so far been submitted, bringing the total since June 2016 to just under 3,000.

Sweden first allowed dual citizenship in 2001, while countries like Spain still require applicants to forsake their British passport in order to be granted their new one. This has contributed to a comparatively a comparatively lower increase in applications. But Ireland received nearly 9,000 applications between June 2016 and 2017
[...]
Germany's Federal Office of Statistics has not yet made data for 2017 available but 2016 saw an increase to 2,685 applications, up from just 622 in 2015.
[...]
Denmark, also reported a significant rise, after Brits seeking Danish citizenship doubled between 2015 and 2016.

[Sweden] is still involved in a dispute about freedom of movement and personal freedoms.

According to the EU Rights Clinic, a UK-based association that helps people resolve problems to do with European rights, Sweden is in breach of EU law due to its "unduly strict" personal number rules, which govern how people access everything from healthcare to bank accounts. The so-called `personnummer' opens up private and public services but is only issued to EU citizens that can prove they will reside in Sweden for at least a year. But the case hinges on the fact that EU law says people should become eligible after three months [1][2].

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Diversity is the key to economic and political evolution.