Read this and answer the question. If the question is unanswerable, say "unanswerable".

The Internet was developed as a network between government research laboratories and participating departments of universities. By the late 1980s, a process was set in place towards public, commercial use of the Internet. The remaining restrictions were removed by 1995, 4 years after the introduction of the World Wide Web.

When was the Internet further restricted?
unanswerable