Rockets from the Ariane family have accumulated 235 launches since 1979, 224 of which were successful, yielding a 7001953000000000000♠95.3% success rate. Between April 2003 and February 2017, Ariane 5 has flown 77 consecutive missions without failure.
For launches in a specific decade, see:
Statistics are up-to-date as of 27 February 2017.
References
List of Ariane launches Wikipedia(Text) CC BY-SA