Annual growth given growth from start date to end date.

def growthfromrange(rangegrowth, startdate, enddate):
    """
    Annual growth given growth from start date to end date.
    """
    _yrs = (pd.Timestamp(enddate) - pd.Timestamp(startdate)).total_seconds() /\
            dt.timedelta(365.25).total_seconds()
    return yrlygrowth(rangegrowth, _yrs)