These graphs are updated manually as and when the opportunity arises and so will not always be up to date.
Only 'web' authentications are represented here - we don't currently have access to statistics for token-based access.
Used represents accounts used at least once; enabled represents accounts available for use, total represents total accounts in existence. The difference between used and enabled represents pre-existing cam.ac.uk domain accounts that have not been used since the launch of Google Apps @ Cambridge; the difference between enabled and total represents accounts that have been disabled becasue the user has left t he University but which have not yet been deleted.