The OECD calculates the number of companies operating in the administrative activities and support services sector. These are companies active in "Rental and leasing activities", "Work activities", "Travel agencies, tour operators, booking services and related activities", "Security and investigative activities; services to construction and landscaping activities; office administration, office support and other business support activities”. The data refers to OECD countries in the period between 2005 and 2022.