def utf8_encoding(t):
    """UTF-8 Encoding. Note that the exa values are shown with a '%'.

    >>> utf8_encoding("A")
    'A'
    >>> utf8_encoding("Año")
    'A%C3%B1o'
    """
    return "".join("%%%X" % ord(x) if ord(x) > 127 else x for x in t)