The sector's other targets would remain the same - a 15 per cent reduction in overall crime, a 20 per cent reduction in violent crime and a 25 per cent reduction in re-offending by 2017.
Statistics New Zealand figures showed conviction rates in the Youth Court were at their lowest point since records began in 1992.
These figures did not reflect all offending by young people, because most young offenders were not charged and were given alternative penalties.
But Ministry of Justice figures supported the downwards trend in youth offending. Research showed that police apprehensions of people aged 10 to 16 were at a 10-year low.