Miscellaneous statistics

Adult Web sites

Public Web sites whose primary content is sexually explicit images or text.

  No. of sites Percent of public sites
1998 34,000 2.3%
1999 42,000 1.9%
2000 68,000 2.3%
2001 74,000 2.4%
2002 102,000 3.3%

IP address volatility

Percent of IP addresses identifying a Web site in Year A also identifying a Web site in Year B. For example, 56% of the IP addresses identifying a Web site in the 1998 sample also identified one in the 1999 sample.

All sites

  1998 1999 2000 2001 2002
1998 100% 56% 35% 25% 13%
1999 NA 100% 55% 37% 19%
2000 NA NA 100% 55% 33%
2001 NA NA NA 100% 51%
2002 NA NA NA NA 100%

Public sites

  1998 1999 2000 2001 2002
1998 100% 52% 28% 15% 8%
1999 NA 100% 50% 27% 14%
2000 NA NA 100% 47% 26%
2001 NA NA NA 100% 46%
2002 NA NA NA NA 100%