As far as I know, it is the highest number in following region:
2013EU00029XXX
2013AS000102XX
2013SA000007XX
2013OC00001XXX
2013AF00105XXX
Total around 150,000 and total 50,000 visas issues, so around first 1/3 out of total case number can go to USA
For example, Asia, if all selectees can go to USA, then cut off should be 3400, but actually someone may not want to go USA, forget confirmation number, not finish secondary education, crime and so on, the number may be higher than that
2013EU00029XXX
2013AS000102XX
2013SA000007XX
2013OC00001XXX
2013AF00105XXX
Total around 150,000 and total 50,000 visas issues, so around first 1/3 out of total case number can go to USA
For example, Asia, if all selectees can go to USA, then cut off should be 3400, but actually someone may not want to go USA, forget confirmation number, not finish secondary education, crime and so on, the number may be higher than that