High and medium-high technology manufacturing accounts for 9.9% of GDP. [ 104 ] The 20 largest (by turnover in 2007) companies registered in Sweden are Volvo , Ericsson , Vattenfall , Skanska , Sony Ericsson Mobile Communications AB , Svenska Cellulosa Aktiebolaget , Electrolux , Volvo Personvagnar , TeliaSonera , Sandvik