The phrase "a substantial decline from" is correct and usable in written English.
It can be used when discussing a significant decrease in a particular metric or value compared to a previous point in time.
Example: "The company reported a substantial decline from last year's profits, indicating a need for strategic changes."
Alternatives: "a significant drop from" or "a considerable decrease from".
His handling of foreign policy is approved by 47percentt of the public; his stewardship of the environment is approved by 39percentt -- a substantial decline from a month ago.
After a substantial decline from 1975 to 1997, the gonorrhea rates had leveled off in recent years.
By the time women reached their 40s, the report found, they had averaged 1.9 births, a substantial decline from the 3.1 births such women averaged in 1976, when the Census Bureau began collecting fertility data.
According to exit polls, Clinton won 53percentt of people making under $50,000 a year, a substantial decline from Obama's 60percentt.
Additionally, schizophrenia often occurs with significant impairment in cognition (Green et al. 2000; Keefe et al. 2006), and a substantial decline from premorbid IQ (Reichenberg et al. 2005).
The new estimate of 791 million undernourished in the developing world for the period 1995-97 represents a substantial decline from the revised 831 million estimate of 1990-92.
Unlike for the CPS, in this case, there is not a substantial decline in precision from including the very large number of "spatial" controls in DLR's specification (Panel B). Figure 5 Leads ("pre-trends") and lags for alternative estimators, QCEW data, 1990-2010.
Our finding of a significant reduction in male infectious disease mortality (-10.03% during 1997-2005) was due to a substantial decline in mortality from tuberculosis and septicemia in Taiwan during the study period (data not shown).
(We actually have seen a substantial decline in the deficit, from 6.0percentt of GDP in 2006 to 3.0percentt of GDP at present).
As an example, in 2010 Kantar Media reported a substantial decline in Internet DTCA from $312 to2022 million (2010 Nielsen Internet DTCA data was not available for comparison).
The study, based on sperm samples from 26,600 healthy men, reports a substantial decline in average sperm counts over 17 years, from 73.6m to 49.9m per millilitre, between 1989 and 2005.
