Germany GDP: ~$4 trillion.
Japan GDP: ~$5 trillion.
USA GDP: ~$17 trillion.
9 * 0.18 = 1.6
17 * 0.12 = 2.0
So, as usual, Mr. Trump's ignorance is causing him to ask the wrong questions.
The USA is getting $6355/person from manufacturing.
Germany+Japan is getting $7792/person from manufacturing.
They beat us, earning an extra 22.6% per person from manufacturing.
Maybe it would be okay if you weighted it based on % of the economy, in which case the USA would be $6355 / 0.12 = $54,441 vs 7792 / 0.18 = $43,289.
So, weighted GPD per capita, the USA comes out way ahead. And actually, the weighted GDP/cap in manufacturing for the USA is higher than the average GPD/cap of the economy overall, which is just $53,041.
But your original argument was that the US doesn't compete with Germany or Japan in manufacturing, when the facts show they not only compete, America fucking decimates those countries in raw output.