The figures presented here are for deaths registered each year, rather than deaths occurring each year. Almost all drug-related deaths are certified by a coroner. Due to the length of time it takes a coroner to complete an inquest, about half of drug-related deaths registered in a particular year will have actually occurred prior to that year.
Nevertheless, general trends in drug-related deaths are broadly equivalent, regardless of whether the data is analysed by year of occurrence or year of registration.
The data presented in this part covers England and Wales combined. The number of deaths for England only is available from the ONS source data. However, as all breakdowns in the ONS data are for England and Wales combined, the overall England and Wales figure is used througout for consistency.
The latest data is for 2018.