The phrase "a dramatic decline of" is correct and usable in written English.
It can be used to describe a significant reduction or drop in something, often in a formal or analytical context.
Example: "The report highlighted a dramatic decline of sales in the last quarter, raising concerns among investors."
Alternatives: "a significant drop in" or "a steep decrease in".
Perennial grasses constitute a major group of species showing a dramatic decline of biodiversity in successional plant communities.
The last ten years has seen a dramatic increase in the ivory trade and, consequently, a dramatic decline of wild elephant populations.
The study analysed 421 individuals born just a few years before and a few years after the 1979 policy, which resulted in a dramatic decline of large families.
Historically, the number of active dunes has decreased significantly due to vegetation stabilization, resulting in a dramatic decline of open-sand habitat for a variety of dune-dependent species.
A dramatic decline of tree pollen over the last centuries suggests that tree cover of both the lowland and upland landscape surrounding the mire declined and forests were increasingly replaced by open vegetation most likely as a result of intensified human activities.
During 1938 1958, the growth of population mixed with cropland expansion led to a dramatic decline of forest and grassland at a rate of 2.04% each year.
The latest OECD data show that the U.S. has experienced a dramatic decline in out-of-pocket spending as a share of health expenditures since 1980 both in absolute terms and relative to other countries.
Following the introduction of the new conjugate Hib vaccine in the late 1993 in Greece, a dramatic decline (92.5%) of Hib meningitis cases was noted in period C. Similar findings have been recorded in the United States [ 24], Canada [ 48] and several European countries [ 46, 49, 51], with reduction levels up to 98%.
Japan has imported Icelandic fin whale for human consumption since 2008, but appears to have moved into the pet food business amid a dramatic decline in consumption of all types of whale meat among diners.
Harry Watson Edinburgh Bishop Richard Harries (Letters, 11 October) cannot be allowed to get away with his reference to a "dramatic decline in membership of political parties" in an attempt to understand the numerical decline of the Church of England.
Finally, the importance of progression for the patients has also been demonstrated by Cella and Colleagues who found a relatively stable course of HRQoL during progression-free treatment period, and a dramatic decline in case of progression [25].
