Starting in 1996, Alexa Internet has been donating their crawl data to the Internet Archive. Flowing in every day, these data are added to the Wayback Machine after an embargo period.
This website is supported by cooperative agreement E11/CCE419270-06 from the National Center on Birth Defects and Disabilities, Centers for Disease Control and Prevention (CDC). Its contents are solely the responsibility of the authors (association or center) and do not necessarily represent the official views of the CDC.