Wall Street wrapped another tumultuous week with more losses Friday as the Dow Jones Industrial average sliced off another 173 points, or 1.6%, to close at 10,817.65. The session wrapped up the market's worst four-week stretch in more than two years.

The Nasdaq fell another 38 points to finish at 2,341.84 while the S&P 500 lost 17 points to close at 1123.53.

At this point, investors seem convinced the U.S. is headed into another recession and the uncertainty abroad -- particularly in Europe -- isn't helping matters much, either.

Here are some facts and figures behind yet another down day for the markets:

Dow Jones Industrial average:

·         Down 451.37 points this week, or 4.01%, to 10817.65

·         Down four consecutive trading weeks.

·         Down 1863.51 points, or 14.70%, over the four-week period.

·         Down five of the past six weeks.

·         Today: DJIA, down 172.93 points, or 1.57%.

·         Down two consecutive trading days.

·         Down 592.56 points, or 5.19%, over the two-day trading period.

·         Largest two-day percentage decline since Monday, March 02, 2009.

·         Largest two-day points decline since Thursday, November 20, 2008.

·         Down three of the past four trading days.

·         Lowest closing value since Wednesday, August 10, 2011.

·         An intraday high of 11086.40 occurred at 10:28:36 today, representing an increase of 95.82 points, or 0.87%.

·         An intraday low of 10801.41 occurred at 15:59:15 today, representing a decrease of 189.17 points, or 1.72%.

·         Seven of the 30 component stocks rose, 22 fell, one was unchanged.

·         Today's top contributors to The Dow's movement and their point(s) contribution: MCD (12.26), WMT (3.86), MRK (1.51), AXP (1.44), PG (0.76).

·         Today's laggards: IBM (-47.60), HPQ (-44.50), CAT (-25.43), BA (-10.52), XOM (-8.48).

·         Traded in negative territory for 87 percent of the day.

·         DJIA crossed zero 14 times during today's trading session.

·         DJIA moved 8243 points during today's trading session.

·         The average tick today was 0.75 point.

·         Down 23.63% from its record close of 14164.53 on Tuesday, October 09, 2007.

·         Up 5.91% from 52 weeks ago.

·         Down 15.56% from its 2011 closing high of 12810.54 on Friday, April 29.

·         Up 0.91% from its 2011 closing low of 10719.94 on Wednesday, August 10.

·         Down 15.56% from its 52 week high of 12810.54 on Friday, April 29, 2011.

·         Up 8.33% from its 52 week low of 9985.81 on Thursday, August 26, 2010.

·         Month-to-date: down 10.92%.

·         Year-to-date: down 6.56%.

Dow Jones U.S. Total Stock Market Index

·         Dow Jones US Total Stock Market Index, 11638.66, (prelim)*, down 621.31 points this week, or 5.07%, to 11638.66.

·         Down four consecutive trading weeks.

·         Down 2457.81 points, or 17.44%, over the four-week period.

·         Down five of the past six weeks.

·         Today: Dow Jones US Total Stock Market Index, down 184.39 points, or 1.56%, or approximately $216 billion in market capitalization.

·         Down two consecutive trading days.

·         Down 766.26 points, or 6.18%, over two-day trading period.

·         Largest two-day points & percentage decline since Monday, August 08, 2011.

·         Down three of the past four trading days.

·         Lowest closing value since Monday, August 08, 2011.

·         Down 4106.73 points, or 26.08% (approximately $5.5 trillion in market cap), from its record close of 15745.39 October 9, 2007.

·         Up 71.15% (approximately $5.7 trillion in market cap), from the 12-½ year closing low of 6800.08 on March 9, 2009.

·         Up 5.46% from 52 weeks ago.

·         Down 18.66% from its 2011 closing high of 14308.37 on Friday, April 29.

·         Up 0.50% from its 2011 closing low of 11580.34 on Monday, August 08.

·         Down 18.66% from its 52 week high of 14308.37 on Friday, April 29, 2011.

·         Up 7.91% from its 52 week low of 10785.39, hit on Thursday, August 26, 2010.

·         Month-to-date: down 13.90%.

·         Year-to-date: down 11.37%, or approximately $1.8 trillion in market cap.

Data courtesy of Dow Jones Indexes.