With 11 months of smoothed sunspot number data so far for Cycle 25, the above plot shows Cycle 25 still rising a bit faster than Cycle 24 - but certainly not as fast as Cycle 19.
ARRL DX CW 2012 - Which 10M Path
Is the ionosphere really lower
Grand Solar Minima
Butterfly Diagrams and Solar Minimum
A Look at All Twenty Three Solar Cycles
The Robust Equatorial Ionosphere