If a page only needs to be changed twice a year, use a static page built outside of the CMS. This reduces CPU usage, bandwidth and electricity consumption.
That is because dynamic content management systems must load the various software layers to serve the content requested by the user — e.g. the HTTP server, applications server, content storage system (database) — and, potentially, related cache systems. On the other hand, a static file is directly read and sent to the user by the HTTP or cache server, skipping the need for the application server or database.