The last Camino Holy Year was in 2010, and before that in 2004. The first Holy Year was in 1122, so it is a very long tradition.
There are also other types of Holy Years that are not related to the Camino de Santiago. Normal Jubilee Holy Years occur every 25 years. The Pope of the day may also declare special Holy Years in between Jacobean and other Holy Years. This is what happened in 2016 when Pope Francis has declared it the Jubilee Year of Mercy.