"high decline" is correct and usable in written English.
You could use it to describe a sudden decrease in something over a period of time. For example, "Sales have seen a high decline in the past month."
"The very high decline rates of shale gas wells require continuous inputs of capital - estimated at $42 billion per year to drill more than 7,000 wells - in order to maintain production.
The average of the entire European Union was characterised by a relatively high decline in the standardised mortality rate for cerebrovascular diseases, reaching 31.5%.
Subsequent to many years of water injection development, most of the onshore oil fields in China went into high water cut, high recovery and high decline rate stages.
The observed high decline of S. sudanense in this study could be attributed to its slightly thicker stems that might have reduced curability and hence retained more moisture compared to the other species, hence increased degradation rates by fermentation.
Cr III) oxidation rates, although initially high, decline well before the supply of β-MnO2 is depleted, suggesting that a reaction product inhibits the conversion of Cr III) to Cr VI).
Consequently, the high decline in sedation before tracheotomy cannot be explained by the timing of tracheotomy.
(Jeremijenko also wanted to mount several "public toilets for pigeons" at the EcoPark, but powers on high declined that part of the proposal).
In fact, the number of abortions in New York, while still very high, declined steadily to 123,048 in 2002, the most recent year for which data is available, from 134,405 in 1995.
When Valdosta High declined to show President Obama's back-to-school speech live to students in September, some black leaders called for the resignation of Cason, who is white.
ER negativity and high expression of Ki-67 was also associated with a high declining of the SUV.
Among high schools, the High School for Teaching and the Professions in the Bronx logged the highest decline, 9 percent.
