(Telecompaper) Overall worldwide smartphone growth is expected to slow further to 11.3 percent in 2015, down from 27.6 percent in 2014, according to the latest data from the International Data Corporation (IDC). Although the researcher is sticking to its forecast of 1.9 billion annual shipments by 2019, the previous forecast of 11.8 percent growth in 2015 has been revised down slightly due in part to saturation in the Chinese smartphone market. In fact, 2015 will be the first year that China's smartphone growth (just 2.5 percent) will be slower than the worldwide market. Android smartphone growth is also expected to be slower than the worldwide market at 8.5 percent in 2015 due to the fact that China accounts for around 36 percent of total Android smartphone shipments.