user: Question: What is the average year that the USD exchange of ￥88.54 had a gross domestic product larger than 477327134?
Columns: ['Year', 'Gross domestic product', 'US dollar exchange', 'Nominal per-capita GDP (as % of USA)', 'PPP capita GDP (as % of USA)']
Types: ['real', 'real', 'text', 'real', 'text']
Sample row: [1955.0, 8369500.0, '￥360.00', 10.31, '–']
SQL:

assistant: SELECT AVG("Year") FROM "Table" WHERE "US dollar exchange" = '￥88.54' AND "Gross domestic product" > 477327134.0;