I am using propensity score matching to find matched exporters and non-exporters using psmatch2 in stata (see the stata codes below), and estimate the sales differences between matched exporters and non-exporters.

psmatch2  exporter employees employees2 capital capital2 industry_* year_*, out(sales) common  neighbor(1)

Could someone please let me know how to restrict matched exporter and non-exporter to be in same industry and same year? In other word, I want to match an exporter A with non-exporter B who have smallest propensity score difference and they have to be in same industry and appear in the same year. 多谢指教.