The phrase "a decline over time" is correct and usable in written English.
It can be used to describe a gradual decrease or reduction in a particular quantity or quality throughout a specified period.
Example: "The study revealed a decline over time in the population of certain bird species due to habitat loss."
Alternatives: "a decrease over time" or "a drop over time".
The most reputable surveys show a decline over time in the share of households with guns".
But he is 32, and although he is likely to age well — he has retained his speed and is remarkably durable — a decline over time is inevitable.
In contrast to the 0.0 g/kg dose that increased the activity over time, animals administered the low dose (0.5 g/kg) demonstrated an initial high activity followed by a decline over time.
He qualified that observation by remarking, "I might've looked at more of a decline over time.... ..... But, he cheerfully observed, "most people I know in the ethanol industry say, 'Fine — we're now up and going.' " Lest anyone doubt his commitment, Romney reminded his audience, "For me, ethanol is part of national security — it is part of America developing our own energy..
With regard to WLR, it should also be noted that a decline over time in a dry atmosphere is normal in insects [25].
If a single mating were able to alleviate sperm-limitation, we would expect differences between treatment groups; fertility in recently mated females should show less of a decline over time compared to that of interrupted females.
a σ-convergence (variations among countries decline over time), b β−convergence (poorer countries have higher growth rates).
In terms of retention, injected MSC/VEGF showed a steady decline over time, with a very small fraction of MSC/VEGF remaining for up to 4.5 months.
"Our hope is that what we will be able to do is continue on what we call a soft-landing approach, a gradual decline over time," the official said, speaking anonymously in line with his agency's policy.
The negative appendectomy rates showed a significant decline over time from a high of 16.0 in 1994 to 10.2 per 100,000 in 2000 (p < 0.0001).
Ser487 phosphorylation was found to be more dynamic, with γ-IR triggering a sharp increase followed by a gradual decline over time.
