Acer has returned to profit after two quarters of back-to-back losses, posting a net income of NT$75 million ($2.5 million) in Q4 2011. Although Acer has avoided a loss this quarter, weak sales have led to a sixth straight quarterly revenue decline. Dwindling interest in netbooks, hard drive shortages, and the continued growth of the tablet market have all been cited as reasons for the company's troubles. 2011 has been a difficult year for the Taiwanese manufacturer, with disappointing profits in Q1 making way for losses in Q2 and Q3, and the company's preliminary results indicate an total annual loss of $212 million. In contrast, the company posted a $601 million profit last year.