Since 2004, Elections Canada has used a sample of administrative data compiled in the course of administering the election to estimate voter turnout by age group and, since 2008, by sex/gender, at the national, provincial and territorial levels. These administrative data, combined with those from the National Register of Electors, offer a more accurate way of measuring and studying turnout than survey-based studies, which consistently overestimate participation. Data for this dataset comes from the reports on turnout by age and gender, which are published after each general election.