2008年までは輸入はともかく輸出はアメリカが一番だったんですが、それも中国で。
The part made me confused is the latter one, "それも中国で". Does it mean "That is also true in China" or something else because it doesn't sound right to me and I hope someone can clear my doubt. Thank you.
For more information, this is a news about Japanese export and import value and the context leads to that sentence about China has beaten America and became the country with highest import and export value to Japan