In the text, some nouns are qualified with adjectives (sharp, sudden) and some verbs with adverbs (dramatically, significantly).

Adjectives used to describe movement include: slow, slight, moderate, gradual, steady, quick, rapid, significant, sharp, substantial, dramatic.

Used to show a small change: slight

Used to show a regular movement: gradual, steady

Used to show considerable, striking or unexpected change: significant, substantial, dramatic (both positive and negative change), sharp, sudden

Adverbs are formed by adding -ly to the adjective, and sometimes one or two other letters change as well.

Degree of change:

dramatically, considerably, significantly, substantially, sharply, moderately, slightly

Note that "dramatically" can refer to both good and bad changes.

Speed of change:

rapidly, quickly, suddenly, gradually, steadily, slowly