Child and youth crime rates continue to fall, but statistics show some serious offences are on the rise.
Youths committed 3582 offences that went through the Youth Court in 2011, down from 3939 offences in 2010, according to Statistics New Zealand.
Of those, 1812 were discharged and 786 were not proven, compared to 1872 and 822 respectively in the previous year.
Homicides were down to six in 2011 from nine in 2010 and acts intended to cause injury offences fell from 537 to 516.
Sexual assaults were up, however, from 72 in 2010 to 81 last year.
The only other offences on the rise were abduction and harassment, and property damage and environmental pollution.
The majority of crimes were committed by young men, nearly 2850, while woman committed 732.
Across all age groups, only children aged 12 and 13 were involved in more crimes, up to 12 last year from three in 2010.