Please help me with this IELTS writing task 1

The given bar charts provide information about how many bee colonies and the amount of honey which they produced in America over a forty-year period from 1970 to 2010.Overall, it is clear that both the number of bee colonies and the amount of honey which bee made fell during the forty-year period. Another interesting point is that when colonies rose in 1980, honey production decreased, while when the colonies went down in 1990, honey production went up.
As can be seen from the charts, in 1970, there were 4 million bee colonies and then it increased by 200,000 to 4.2 million in 1980. However, over the next 30 years, there was a sharp decrease of 2,4 million to 1,8 million in the number of bee coconies in 2010.During the same period, in 1970, there were 130,000 tons of honey and then went down to 110,000 tons in 1980. The amount of honey then increased again to 120,000 in 1990. However, over the next 20 years, there was a dramatic fall of 50,000 tons to 70,000 tons in the amount of honey.