Tablet shipments rose an eye-popping 117% Y/Y in Q1 to 40.6M, estimates Strategy Analytics after digesting Apple's (AAPL) iPad data. For reference, IDC estimates PC shipments fell 13.9% Y/Y in Q1 to 76.9M, which indicates the PC/tablet sales ratio is now below 2:1. The iPad is estimated to have 48.2% of the market, and Android (GOOG) tablets 43.4%. Windows 8/RT (MSFT) is believed to have a 7.4% share, but that only amounts to 3M units. In March, IDC raised its 2013 tablet forecast to 190.9M units, while estimating Android would have 48.8% of the market and the iPad 46%.