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Yes, they have decreased significantly decreased.
You can use "decreased" in a sentence like this: "The demand for the product decreased significantly after the price increase."
No it hasn't.
The poverty rate decreased significantly
Only if his income has significantly decreased.
the orbit
it has significantly decreased.
Chickenpox has decreased significantly in the last 20 years in the US since chickenpox vaccine was approved in the US in 1995.
Very successful. Many air pollutants have decreased significantly..:-)
The use of quality circles has decreased significantly.
The ipod nano sale price has decreased to about $100 dollars. When it first came out, the price was well above that, but with other models coming out, the price has decreased significantly.
they brought disease