The total number of all types of SAR missions is up over the last fifteen years by a substantial amount. But over the last half dozen years, I think the number has been fairly constant, averaging about 145-160 per year for all types.
Thanks. This is as I suspected. To me, this exactly corresponds to the adoption of cell phones.
If you have the time, I would really love to hear your thoughts on frequency of the various equipment related rescue scenarios.