回答

✨ ベストアンサー ✨

👍 Your text is well written. There are only a few issues.

✖ This graph shows the number of UFO sighting from 1990 to 2020.
👉 sighting is a countable noun
👉 number of <countable noun in the plural>
✅ This graph shows the number of UFO sightings from 1990 to 2020.

✅ The number was increasing steadily from 1990 to 2014.
👉 The perfect past is OK, but not really necessary. You are describing a sequence of events.
✅ The number increased steadily from 1990 to 2014.
△ And the number peaked at 8736 in 2014.
👉 It is bad style to start an English sentence with "And"
✅ The number increased steadily from 1990 to 2014. It peaked at 8736 in 2014.
✅ The number increased steadily from 1990 to 2014, and it peaked at 8736 in 2014.
✅ The number increased steadily from 1990 to 2014 before it peaked at 8736 in 2014.
✅✅ The number increased steadily from 1990 to 2014, peaking at 8736 in 2014.

✖ This number was about 27 times as many as 319 in 1990.
△ This number was about 27 times as many as the 319 in 1990.
✅ This number was about 27 times as high as the 319 sightings in 1990
✅ This number was about 27 times higher than the 319 sightings in 1990
✅ This number was about 27 times higher than the 319 sightings reported/recorded in 1990

✅ However, the number declined drastically from 2014 to 2018.

△ Also, from 2018 to 2020 the number increased again.
👉 "Also" doesn't sound right here, because you are describing a linear progression of events.
✅ From 2018 to 2020 the number increased again.
✅ Then, from 2018 to 2020 the number increased again.
✅ But then, from 2018 to 2020 the number increased again.

△ In 2020, the number was twice as many as in 2018.
✅ In 2020, the number was twice as high as in 2018.
✅ In 2020, the number was about twice as high as in 2018.

✅ Then, from 2018 to 2020 the number increased again, finally returning to the level of 2015.
✅ Then, from 2018 to 2020 the number increased again, but without reaching/surpassing the peak/level of 2014.

✅ I hope this is helpful!

Thank you for your easy to understand explanation‼️‼️🥹

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