My memory may be a little old but the following graph shows the trends of expenditure for the US troops in Japan from 1997 to 2014 when PM Abe took power.
Blue: Total defense budget
Red: Budget for JSDF
Green: Budget for the US military
Budget to purchase weapons from the US is included in the red line as JSDF costs. It is estimated around $5 billion on average.
The budget for the US covers about 80% of the total US troops costs in Japan. For references, it is about 40% in Korea, 32% in Germany in 2004.
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