when were the luminous mysteries added to the rosary
From the 16th to the early 20th century, the structure of the rosary remained essentially unchanged. There were 15 mysteries, one for each of the 15 decades. During the 20th century, the addition of the Fatima Prayer to the end of each decade became more common. There were no other changes until 2002, when John Paul II instituted five optional new Luminous Mysteries, although variations of these had already been proposed by the likes of St. Louis de Montfort and were implemented during the mid-20th Century by figures such as Patrick Peyton.