"The global semiconductor foundry market grew 4.4 percent in 2015 to reach $48.8 billion in value, according to market research company Gartner" (more below).
Semiconductor foundries were able to still grow their business in 2015 even though the overall demand for semiconductors shrunk. Of the foundries based in China, the largest foundry- SMIC had the largest increase in growth of 13.1%.
At the same time, the overall semiconductor market shrunk more than 2% in 2015 - See tables below.
Global Semiconductor Market Slumps in 2015, IHS Says
Worldwide Semiconductor Revenue Declined 2.3 Percent in 2015, According to Final Results by Gartner)