Every country is different based on it's status of forces (SOFA) agreement. In Japan it's apparently a shared expense, Japan pays $5B US and the US pays the rest. Considering the expense, that's probably about 15%.
As far as China is concerned, that was kind of my point. The Japanese citizen pays a pittance for our occupation, but consider the alternative. If parliament promised to build new facilities OFF Okinawa (which they DID), and close Futenma and Atsugi so that the very valuable real estate they sit upon can be developed (and make no mistake, that's what this is about, not Marines raping little girls, and NOT helicopter noise pissing people off) then the citizens of Okinawa, who have historically been shit upon by the mainland, should hold PARLIAMENT'S feet to the fire.
I don't wear a uniform anymore and don't truly give a shit. I just think it's funny that foreign governments want US bases to protect them, invite us in, and then complain to their citizenry that we are looting their nation. Diego Garcia and Masan, Kyrgyzstan are the latest examples.