Muddled rare earths data

http://www.reuters.com/article/2011/03/24/us-china-rareearth-idUSTRE72N0X720110324Reuters and WSJ gave different data in both export volume and prices:

WSJ: China’s export of rare earths in Jan and Feb: 7,084 metric tons (up 0.3% than last year). China’s first half export quota: 14,509 metric tons

Price: $44,461 a ton on average (almost doubled last year’s average $23,603)

WSJ: Rare earths stay hot 

Reuters:

Export 750 ton in Feb. 647 in Jan. (That is 1,397 tons).

In Feb: 281 tons went to Japan, valued at $38.9 million or $138,406 per ton.

Prices in February: $109,036 “on a free on board basis”. Rare earths price in July last year: $14,405 on average

Reuters: China rare earth prices explode as export volumes collapse 

A possible explanation could be different data they use. WSJ cited data from "Hong Kong-based Economic Information & Agency, which publishes statistics it gets from China's General Administration of Customs". Reuters calculated its own data, because: “China’s Customs office changed its method of presenting rare earths exports in its headline data this year, boosting the reported volume by including products made from rare earth metals in the total.”