to rank 排名
The report ranks the UK 20th out of 22 advanced nations.
Agassi was at that time ranked sixth in the world.
Sandoz ranks as one of the 10 largest drug companies in the world.
China ranks among the safest countries in the world.
The Rams have ranked near the bottom of the NFL for two s

as + adjective/adverb + as  
The figures were twice as high as the previous year.
The figures were three times as high in France as in Germany.
The newer model was four times as popular as the older version.
Clothing prices have not inflated as much as automobiles.

The general construction for percentage is:
15 + percent + of + the + total

Last semester, 78 percent of the first-year students passed English Composition.
In just four years, the divorce rate rose from 12 to 24 percent.
The adults account for (make up/take up) over 80 percent of the total QQ

dramatically greatly and suddenly
Output has increased dramatically.
Universities have suffered a dramatic drop in student numbers.

sharp(ly) suddenly and by a large amount
Prices have risen sharply over the last few months.
There has been a sharp rise in

variation    变化 a change or slight difference in a level, amount or quantity
The survey found a wide variation in the prices charged for canteen food.
France had the biggest variation in the spending, ranging from a low of just over 1.4 m to a high of nearly 2.1

peak   到达最高点 to achieve a maximum of development
Sales peaked at 450 million in August, and then fell sharply.
The party's membership has fallen from a peak of forty thousand after World War II.
The population dropped from a peak of 800,000, levelling off in 1999

increase noun [uncountable and countable] an occasion when the amount or number of something becomes bigger:
• There has been a significant increase in the number of people living alone.
• England's countryside is under threat from a massive increase in (=a very big increase) traffic.
• Profits rose by $2million. This rep

increase verb [transitive] to make something become larger in number, amount, price, or value:
• The company wants to increase the number of phones it sells in the UK.
• Smoking increases the risk of a heart attack by almost ten times.

raise verb [transitive] to increase prices, ta

increase verb [intransitive] to become larger in number, amount, price, or value:
• Last year, the number of burglaries increased by 15 percent.
• The percentage of households with a computer increased from 32.9% to 52%.
• The world's population is increasing at a rate of 91 million people each year.