Answer:
The country's population decreased about 5.8 % during this time period.
Step-by-step explanation:
Population in 1990 = 164 million
Population in 2010 = 155 million
Determine the percent decrease
The formula used is: ![Percent\:Decrease=\frac{Initial\:Value-New\:Value}{New\:Value}\times 100](https://tex.z-dn.net/?f=Percent%5C%3ADecrease%3D%5Cfrac%7BInitial%5C%3AValue-New%5C%3AValue%7D%7BNew%5C%3AValue%7D%5Ctimes%20100)
We have :
Initial Value = 164 million (164,000,000)
New Value = 155 million (155,000,000)
Finding percent decrease
![Percent\:Decrease=\frac{Initial\:Value-New\:Value}{New\:Value}\times 100\\Percent\:Decrease=\frac{164,000,000-155,000,000}{155,000,000}\times 100\\Percent\:Decrease=\frac{9,000,000}{155,000,000}\times 100\\Percent\:Decrease=5.8\%](https://tex.z-dn.net/?f=Percent%5C%3ADecrease%3D%5Cfrac%7BInitial%5C%3AValue-New%5C%3AValue%7D%7BNew%5C%3AValue%7D%5Ctimes%20100%5C%5CPercent%5C%3ADecrease%3D%5Cfrac%7B164%2C000%2C000-155%2C000%2C000%7D%7B155%2C000%2C000%7D%5Ctimes%20100%5C%5CPercent%5C%3ADecrease%3D%5Cfrac%7B9%2C000%2C000%7D%7B155%2C000%2C000%7D%5Ctimes%20100%5C%5CPercent%5C%3ADecrease%3D5.8%5C%25)
So, The country's population decreased about 5.8 % during this time period.