Performance of the Dow Jones industrial average by month this year:
Dec. 30, 2011, close: 12,217.56.
— January: Up 415.35 points.
— February: Up 319.16 points.
— March: Up 259.97 points.
— April: Up 1.59 points.
— May: Down 820.18 points.
Thursday's close: 12,393.45.
