Technology giant IBM posted its seventh straight quarter of declining revenue Tuesday as the company, known as Big Blue, announced an annual sales drop for the second straight year.Fourth-quarter sales slid 5.5% to 27.7 billion dollars compared to a year earlier, while annual revenue dropped 5% to 99.8 billion dollars, the first time since 2010 that sales have been below 100 billion dollars, according to the (DPA).The gloomy sales picture was brightened by a 6% boost in fourth-quarter profit to 6.19 billion dollars, largely due to a lower tax burden.The company performed worst in the Asia Pacific region, where revenues decreased 16%, compared to a 1% increase in Europe, Africa and the Middle East and a 3% drop in the Americas.Revenues in the major emerging-market BRIC countries , Brazil, Russia, India and China , decreased 14%.