- The Ethnic Violence in China (EVC) database: this is a geo-coded database of yearly incidents of ethnic violence at the county level in Xinjiang from 1990 to 2005. We have a forthcoming paper in China Review that introduces this data set: pdf; online appendix. Please email us (xuc11 at psu.edu) and we will share the data: here is a PDF that describes the panel and event versions of the EVC data.