However, the price, purity and availability of methamphetamine remain high, according to the latest Tackling Methamphetamine: Indicators and Progress Report, released yesterday.
The average price of a gram increased from $678 in 2012 to $684 last year, indicating a small squeeze on supply. Purity since last year has risen, after a slight decline from 2006 to 2012.
The reported noted a slight decline in availability in recent years. Last month, 39 per cent of frequent users reported availability as "very easy", down from 44 per cent the previous year.
Mr Key was confident the Government's combined measures would continue to put pressure on the P trade.
"We're also looking to fund research to better understand the social costs of illicit drug and alcohol use, and the prevalence of both mental health disorders and substance abuse in prisoners."
Dirty money
• Funds from gang assets forfeited to the Crown are bid on by government departments.
• Since December 2009, police have received forfeiture orders for assets worth $37.6 million.
• Successful bids from this round include $1.9m for 10 extra police investigators to fight gangs and drug rings.