pytz.country_names UnicodeDecodeError exception

Wily:
# python3 -c 'from pytz import country_names
for item in country_names.items():
  print(item)'
Traceback (most recent call last):
  File "<string>", line 2, in <module>
  File "/usr/lib/python3.4/_collections_abc.py", line 497, in __iter__
    for key in self._mapping:
  File "/usr/lib/python3/dist-packages/pytz/lazy.py", line 41, in __iter__
    self._fill()
  File "/usr/lib/python3/dist-packages/pytz/__init__.py", line 350, in _fill
    line = line.decode('US-ASCII')
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 3: ordinal not in range(128)

# python -c 'from pytz import country_names
print(country_names)'
Traceback (most recent call last):
  File "<string>", line 2, in <module>
  File "/usr/lib/python2.7/UserDict.py", line 172, in __repr__
    return repr(dict(self.iteritems()))
  File "/usr/lib/python2.7/UserDict.py", line 110, in iteritems
    for k in self:
  File "/usr/lib/python2.7/dist-packages/pytz/lazy.py", line 41, in __iter__
    self._fill()
  File "/usr/lib/python2.7/dist-packages/pytz/__init__.py", line 350, in _fill
    line = line.decode('US-ASCII')
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 3: ordinal not in range(128)

# dpkg-query -l python-tz python3-tz tzdata
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-==============-============-============-=================================
ii python-tz 2014.10~dfsg all Python version of the Olson timez
ii python3-tz 2014.10~dfsg all Python3 version of the Olson time
ii tzdata 2015f-1 all time zone and daylight-saving tim

Also affect trusty and vivid in the same way. Testing on trusty shows that this broke with the release of tzdata=2015f-0ubuntu0.14.04, prior to that tzdata version country_names could parse the data. debdiff shows that tzdata=2015f-0ubuntu0.14.04 changes this file, and others to utf-8 from ascii.