下载地址：http://www.wto.org/english/res_e/statis_e/its2011_e/its2011_e.pdf
http://www.wto.org/english/res_e/statis_e/its2012_e/its2012_e.pdf
http://www.wto.org/english/res_e/statis_e/its2013_e/its2013_e.pdf
http://www.wto.org/english/res_e/statis_e/its2014_e/its2014_e.pdf
http://www.wto.org/english/res_e/statis_e/its2015_e/its2015_e.pdf
http://www.wto.org/english/res_e/statis_e/its2016_e/its2016_e.pdf
http://www.wto.org/english/res_e/statis_e/its2017_e/its2017_e.pdf
http://www.wto.org/english/res_e/statis_e/its2018_e/its2018_e.pdf
http://www.wto.org/english/res_e/statis_e/its2019_e/its2019_e.pdf
http://www.wto.org/english/res_e/statis_e/its2020_e/its2020_e.pdf
http://www.wto.org/english/res_e/statis_e/its2021_e/its2021_e.pdf