Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_34963 ( "Eruptions" text, "Country" text, "Location" text, "Year" real, "Volcanic Explosivity Index" text, "Fatalities" text )

### Question ###
How many years have a Location of pacific ring of fire, and Eruptions of pinatubo?

### Accurate SQL ###

SELECT SUM("Year") FROM table_34963 WHERE "Location" = 'pacific ring of fire' AND "Eruptions" = 'pinatubo'