How many years did Mt.Pinatubo have a sign of activities?

Question

Mt.Pinatubo was located on the Philippines it started its sign of activity in 1990, it erupts on April 15,16,17,18,19,20,21,23,25,27,29,30,the whole month of May and june 5,9,11,12,13,14,the main eruption of June 15,July12,August 16,17 and August 20.

Answer 1

You got it, about 15 years.