Truth is, crime has fallen everywhere for decades and we don't really know why. Maybe globalization? The banning of lead in gasoline? That's a real mystery worth solving.
For any non-swedes who may be interested enough to follow this: BRÅ is the "Swedish National Council for Crime Prevention". The are tasked with doing research on crime and how to prevent it.
Meanwhile, this particular authorithy actually published new stats recently. For example:
Over the past three years 1.7% of the population of Sweden reported they were subject to sexual crimes. During the period 2005-2012 this number was relatively stable at around 1%. So we are talking about a 70% increase in just a few years.
The most obvious thing that changed during these three years? Massive, historically unsurpassed immigration levels from Africa/The Middle-East.
https://www.bra.se/bra/brott-och-statistik/valdtakt-och-sexu...
(The graph there is quite telling.)
I'm definitely in favour of more high-quality research into the causes of crime and its relationship with immigration, social factors, gender etc. Again, we need facts, which can only be won by serious, honest research, not glib generalizations.
Bonus link: http://www.nature.com/articles/srep39589
b) How about you actually stating that BRÅ should re-do their crime stats based on immigration status etc? Not that it matters one bit in the grand scale of things, but since you seem to be escaping the issue I would like to see you say yes or no.