PARIS, Jan 1 (Reuters) - New car registrations in France fell 15.14% in December compared with the same month a year earlier, partly due to a global semiconductor shortage and as a new wave of coronavirus infections creates uncertainty. In total, 158,121 passenger vehicles were registered last month, France"s CCFA association of carmakers said on Saturday. For all of 2021, registrations were up just 0.5% at 1.66 million compared with 2020"s multi-year low.