https://www.digitimes.com/news/a20190117VL201.html?mod=2
 
As a consequence of the market interest for the 7 nm process, it has rapidly become TSMC's biggest revenue generator as soon as 4Q18. The company said that 7 nm already generated 10% of the company's entire 2018 revenue, despite the process only having been ramped up in June of the same year. Other less dense technologies still generate a lot of revenue for the company, and are likely much higher volume. However, TSMC is most likely riding on much increased ASP for 7 nm wafers than for other technologies. More companies will no doubt turn to lower die wafers from TSMC as time goes on.