Updated from 8:00 a.m. ESTJust the fear that a company won't raise its dividend is enough to cause a stock to drop. Look at what happened to Allstate ( ALL) last week. The homeowners and automobile insurance company had its biggest drop in the last three months after the company stated that, due to its latest quarterly loss, it might end its 14-year track record of raising its dividend. Fortunately, more than a dozen companies were doing well enough to bump up their dividend last week, including TransAlta ( TAC). Stockpickr has reviewed the list of dividend declarations and compiled a portfolio of the top dividend-increasers for the week. To read more, visit Stockpickr.com. In Monday trading, shares of TransAlta closed at $17.93 (down 1.65% for the day; down 10.39% year-to-date).