Six months after Netscape released its browser, Web traffic became the leading type of traffic on the Internet. For example, Web traffic accounted for 21 percent of the traffic on the National Science Foundation's NSFNET backbone, while the No. 2 usage, File Transfer Protocol, traffic accounted for 14 percent of the traffic, according to livinginternet.com. This was a sign of the rapid adoption of Navigator, which saw 50 million copies distributed in its first two years, according to BusinessWeek.