Trend 1978 - 2012. China Data Center, University of Michigan. China Yearly Statistics (National/Provincial/City/County): Post and Telecommunication Services | Country: China | All Provinces: Henan | Cities: Zhoukou City | GroupCode: 1801.b0101 | Labor Metric*: Business Volume of Post and Telecommunication Services - Current period value, 1978-2012. Data-Planet™ Statistical Ready Reference by Conquest Systems, Inc. Dataset-ID: 035-002-014.