There have been several corresponding trends in the availability, use and treatment of methylamphetamines since 2003–04. Following a decline between 2006–07 and 2009–10, there have been increases across many factors relating to methylamphetamines to 2013–14. Arrests, seizures and detections have all increased. Users are now favouring the crystal form of methylamphetamine. They are using it more frequently, and, there appear to be more new users of crystal. There are more people in treatment reporting smoking as their usual method of use for amphetamines than previously.