According to IDC, PC shipments have posted a record decline in Q1 2013. The year-on-year contraction was the worst the research company has seen in its near twenty-year history of quarterly tracking the PC market.
http://www.notebookcheck.net/PC-shipments-see-biggest-drop-in-almost-20-years.90984.0.html
I think due to increment in tax in some countries is a cause of it,