Q: Passage: Law & Order: Special Victims Unit (often abbreviated to Law & Order: SVU or just SVU) is an American police procedural, legal, crime drama television series set in New York City, where it is also primarily produced. In the style of the original Law & Order, episodes are often "ripped from the headlines" or loosely based on real crimes that have received media attention. Created by Dick Wolf, the series premiered on NBC on September 20, 1999, as the second series in Wolf's successful Law & Order franchise. Law & Order: Special Victims Unit has been nominated for and won numerous awards, including the 2006 Emmy for Outstanding Lead Actress in a Drama Series for Mariska Hargitay, the first, and to date only, Emmy to be received by a regular on any Law & Order series. It is the current longest running scripted non-animated U.S. primetime TV series since the cancellation of the original Law & Order on May 24, 2010 and is the fourth-longest running scripted U.S. primetime TV series on a major broadcast network.

Question: Based on this passage, what year did law & order svu air?
Let's give stream of consciousness below

To answer the above question, the relevant sentence is: Created by Dick Wolf, the series premiered on NBC on September 20, 1999, as the second series in Wolf's successful Law & Order franchise. So the answer is 1999.