In 1998, nearly 10% of all email traffic on the internet was SPAM. By 2003 that number had climbed to 50%, and the problem had gotten so bad that Congress passed the CAN-SPAM Act of 2003 (Controlling the Assault of Non-Solicited Pornography and Marketing Act)

The specific requirements and penalties of that law, (which took effect in 2004) have done little to stem the tide of junk email we all receive. Today, in 2005, the percentage of unsolicited email is at an all time high of 87% (source