It reached 1.8 trillion US dollars (purchasing power parity) in 2014—1.7 per cent of global GDP. In 2016,95 per cent of the world's population was in range of at least a second-generation (2G) signal and 84 per cent received at least a third-generation (3G) signal. More than half the world's population, or nearly 4 billion people, lived in cities in 2015.