"The success rate of 95% of the H-2A is on a par with 96.4 percent for the Atlas V of the United States and 94.9 percent for the European Ariane 5"
The much smaller Japanese Mu series is a solid space launcher and provides a much better technology base for missiles. http://en.wikipedia.org/wiki/Mu_%28rocket%29
Here's a list of various Japanese launch systems and their success rates.
System - success - fail - percent success
- Epsilon - 1 - 1 - 100%
- GX - 0 - 0 - (abandoned)
- H-1 - 9 - 9 - 100%
- H-2 - 5 - 1 - 80% (or 60%, one of the successes was a partial failure)
- H-IIA - 23 - 1 - 95.7%
- H-IIB - 4 - 4 - 100%
- J-I - 1 - 1 - 100% (then abandoned)
- Lambda 4 - 9 - 5 - 44%
- Lambda 4S - 5 - 4 - 20%
- M-V - 7 - 1 - 85%
- N-I - 7 - 1 - 85%
- N-II - 8 - 0 - 100%
