Each year, the NTA publishes a report on the overall picture from NDTMS. The report summarises the key statistics over the course of the year, and presents a variety of breakdowns of the treatment population (by age, sex, ethnicity, drugs use, referral sources etc). It also demonstrates any trends that are apparent through comparison with similar breakdowns for previous years.
Reports are available for each (financial) year since 2003 / 04, and can be accessed from the NTA Facts and Figures portal.