The phrase "average rate of expansion" is correct and usable in written English.
It can be used in contexts discussing growth, development, or changes over time, particularly in scientific or economic discussions.
Example: "The average rate of expansion of the universe has been a topic of significant research in astrophysics."
Alternatives: "mean growth rate" or "typical expansion rate."
"And business surveys point to something closer to 2% for the second half of this year, somewhat faster than the economy's historical average rate of expansion.
The IMF said global trade had grown by just over 3% per year since 2012, less than half the average rate of expansion during the previous three decades.
In October, the IMF said the sum of trade across the world had grown by just over 3% per year since 2012, less than half the average rate of expansion during the previous three decades.
As forecast by the China Association of Comprehensive Resources Utilization [2], the wind power installed capacity by 2015 will be around 110 GW to 130 GW, average rate of expansion is around 21% 25% % p.a.; and by 2020, the wind power installed capacity will be around 200 GW to 230 GW, average rate of expansion is around 17% 19% % p.a.
The slowdown is largely accounted for by a below average rate of expansion in Brazil, where crops were hit by droughts in parts of the country and exceptionally damaging rains affecting in particular wheat producing regions.
It can be interpreted as follows: because of (iii) in (3.28) we have ( J^+ ( gamma ) > 1 ) (here we choose the determinant using the density coming from the metric ( Vert bullet Vert _rho )) and this expression measures the averaged rate of expansion in ustable directions ( E_{rho _gamma }^+ ) along the closed orbit ( gamma ).
The horizontal axis shows the annual average rate of credit expansion relative to GDP growth.
With the unemployment rate at a nine-year high of 6.4percentt in June and consumer spending rising at half the average rate of the 1992-2000 expansionexpansome, someconomiststs question whether the rate of borrowing can be sustained.
These price signals triggered an expansion of the Mongolian goat herd at an annual average rate of 10% over the period, to reach 20 million head (the vast majority of which are cashmere goats).
The generator was able to produce foam with expansion ratio between 298 and 892 that collapsed at an average rate of 0.4 cm per minute.
The average rate of support for his proposals was 39%.").
