The three prequel films were also released at three-year intervals, with the final film of the trilogy released on May 19, 2005.
From then on they are continually involved in motherhood, producing babies at two to three-year intervals.
The three-year interval may not be correct.
Five more such festivals using more modest forces followed at three-year intervals.
Assume that they left Mars at some time during the three-year interval following their departure from Heraldic.
Mass treatment has been recommended at six-month to three-year intervals, depending whether there is a continuous high or seasonal low transmission (more often with the former).
In 1980 the cancer society changed its recommendation to a three-year interval.
Detroit was content to make trivial product design changes at three-year intervals, but the electronics industry routinely expected order of magnitude advances in the same time.
As you see, the earliest records are in three-year intervals.
Subsequently, conferences have been held at two- or three-year intervals with published preprints on a topic of current interest.