Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Eruptions | Country | Location | Year | Volcanic Explosivity Index | Fatalities |
| --- | --- | --- | --- | --- | --- |
| Mount Vesuvius | Italy | Mediterranean | 79.0 | 5 | 02001 >2,000 |
| Hatepe (Taupo) | New Zealand | Pacific Ring of Fire | 186.0 | 7 | 00000 ? |
| Baekdu | China / North Korea | Pacific Ring of Fire | 969.0 | 6–7 | 00000 ? |
| Kuwae | Vanuatu | Pacific Ring of Fire | 1452.0 | 6 | 00000 ? |
| Huaynaputina | Peru | Pacific Ring of Fire | 1600.0 | 6 | 01400 ≈1,400 |
| Tambora | Indonesia | Pacific Ring of Fire | 1815.0 | 7 | 71001 >71,000 |
| Krakatoa | Indonesia | Pacific Ring of Fire | 1883.0 | 6 | 36000 36,600 |
| Santa María | Guatemala | Pacific Ring of Fire | 1902.0 | 6 | 07001 7,000–13,000 |
| Novarupta | USA, Alaska | Pacific Ring of Fire | 1912.0 | 6 | 00002 2 |
| Mt. St. Helens | USA, Washington | Pacific Ring of Fire | 1980.0 | 5 | 00057 57 |
| El Chichón | Mexico | Pacific Ring of Fire | 1982.0 | 4–5 | 02001 >2,000 |
| Nevado del Ruiz | Colombia | Pacific Ring of Fire | 1985.0 | 3 | 23000 23,000 |
| Pinatubo | Philippines | Pacific Ring of Fire | 1991.0 | 6 | 01202 1,202 |
Question:
How many years have a Location of pacific ring of fire, and Eruptions of pinatubo?
Answer:
1991.0