user: Question: How many years have a Location of Pacific Ring of Fire, and Eruptions of Pinatubo?
Columns: ['Eruptions', 'Country', 'Location', 'Year', 'Volcanic Explosivity Index', 'Fatalities']
Types: ['text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Mount Vesuvius', 'Italy', 'Mediterranean', 79.0, '5', '02001 >2,000']
SQL:

assistant: SELECT "Year" FROM "Table" WHERE "Location" = 'Pacific Ring of Fire' AND "Eruptions" = 'Pinatubo';