def convert_currency_format(currency_data):
    """
    convert currency data from web raw format to local format
    Args:
        currency_data: dict from www.apilayer.net
    Returns:
        local format dict of FX
    """
    result = {}
    for key in currency_data:
        new_key = key[3:]
        new_val = 1/currency_data[key]
        result[new_key] = new_val
    return result