Source: U.S. Bureau of the Census
Release: Number of Exporters and Known Value for All Countries on a State-by-State Basis
This data series illustrates the movement of exports from the given state to the given country. A missing observation can mean two things. First, missing observations can appear because no exports were made to the listed country that year. Secondly, it could signify a low number of exporters thus giving away proprietary data away.
U.S. Bureau of the Census, Number of Identified Exporters to China from Wisconsin [WICHNA475SCEN], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/WICHNA475SCEN, November 15, 2018.