1996:http://www.stats.gov.cn/ndsj/information/njml.html
1997:http://www.stats.gov.cn/ndsj/information/nj97/ml97.htm
1998:http://www.stats.gov.cn/ndsj/information/nj98n/index98.htm
1999:http://www.stats.gov.cn/yearbook/indexC.htm
2000:http://www.stats.gov.cn/ndsj/zgnj/mulu.html%20
2001:http://www.stats.gov.cn/tjsj/ndsj/2001c/mulu.htm
2002:http://www.stats.gov.cn/yearbook2001/indexC.htm%20
2004:http://www.stats.gov.cn/tjsj/ndsj/yb2004-c/indexch.htm
2005:http://www.stats.gov.cn/tjsj/ndsj/2005/indexch.htm%20