I'm not sure how many bytes SK-hynix now produces, but it was not one of the three largest NAND manufacturers a few years ago. They were Samsung, Toshiba, and Intel-Micron. Sometime earlier, AMD was there as well, but AMD was already overstreched by then.
This blog has no information on the new Taiwanese facility, but some will find interesting.
SK-hynix reached around 30% world DRAM marketshare, largely thanks to the new Wusi plant which, just before the fire, accounted for about 15%.
Here's an EE Times report on the world NAND marketshare between 2012 and 2013: http://www.eetimes.com/document.asp?doc_id=1280394
In 4Q12 the ranking order was: Samsung, Toshiba, SK Hynix, Micron and Intel. Samsung retained first place with a revenue of $2,054 million, about 38.7 percent market share; Toshiba sold $1,466 million or 27.6 percent of the market; SK Hynix is third with $673 million, 12.7 percent of the market; Micron slipped to fourth with $655 million, 12.3 percent of the market; Intel is fifth with 455 million, 8.6 percent of the market.
For the whole of 2012 the order was Samsung, Toshiba, Micron, SK Hynix and Intel. Samsung, Micron and Intel grew market share compared with 2011 at the expense of Toshiba and SK Hynix.
Samsung's 2012 NAND flash sales were $7,286 million, about 38.2 percent market share; Toshiba sold $5,322 million for 27.9 percent of the market; Micron with $2,648 million of annual NAND flash sales captured 13.9 percent of the market; SK Hynix is fourth with $2,261 million and 11.9 percent of the market; Intel is fifth with 1,545 million, 8.1 percent of the market.
Combined marketshare of Intel-Micron is larger than that of SK-hynix which makes the latter 4th with just a little more than 10% marketshare.
And for DRAM: http://www.dramexchange.com/WeeklyResearch/Post/2/3472.html
The Chinese mainland map says Beijing in the north, Wuxi and Shanghai in the southeastern coastal area though Wuxi itself is hundreds of kilometers away from the Yellow Sea. The next image shows inside of Wuxi SK-hynix plant.