Robbery, burglary and sexual assault crimes have risen in recent years, while thefts have gone down, latest crime statistics show.

And while the number of crime victims has risen most sharply in the eastern and central North Island, it has dropped by 19 per cent in Auckland City.

Research released this week from the Parliamentary Library collated crime data from 1994 to 2017, which included different data sets due to police changing the way crime was recorded.

From 2015 to 2017 - when police started counting victims of crimes and offenders, rather than every act of crime - theft accounted