Large declines - S&P500 1950-2009

I am posting this in english as well, just in case some english speaking readers are stumbling by.

I have taken a look at the large declines of the S&P500 inspired by todays decline of approximately 5%. The table below shows the return over the next 1-10 days following such a decline. The edge is on the short side, if any, after declines greater than 4%, but smaller than 6%. After declines larger than 6% taking a long position seems advantagous.