code: @Nonnull
    public CalendarIntervalScheduleBuilder withIntervalInYears (final int intervalInYears)
    {
      _validateInterval (intervalInYears);
      m_nInterval = intervalInYears;
      m_eIntervalUnit = EIntervalUnit.YEAR;
      return this;
    }
docs: Specify an interval in the IntervalUnit.YEAR that the produced Trigger will
  repeat at.
  
  @param intervalInYears
  the number of years at which the trigger should repeat.
  @return the updated CalendarIntervalScheduleBuilder
  @see ICalendarIntervalTrigger#getRepeatInterval()
  @see ICalendarIntervalTrigger#getRepeatIntervalUnit()