Oct. 10 (Bloomberg) -- The Dow Jones Industrial Average would have to fall about 18 percent more to reach its ``trend line'' since August 1982, when the 1980s bull market started, according to Peter Boockvar, an equity strategist at Miller Tabak & Co. in New York. http://www.bloomberg.com/apps/news?pid=20601109&sid=amX076XhpyXk&refer=home
Based on his description I came up with the 5100 area, more than 40% below where we closed. Personally I wouldn't use that as a valid TL though.