Please help me to improve my essay. I did realize it is longer than it supposed to be, but I am not sure which information should be redundant.
amount of electricity produced from different energy sources
The given line chart compares how much electricity was generated from three sources to provide New York in two decades from 1980. While the quantity of petroleum and natural gas experienced upward trends, the remaining went down slightly. Also, petroleum always contributed the most energy while natural gas overtook coal to become the second common source of supply.
Commencing by 350 million kW hours in 1980, the petroleum figure rapidly increased to 600 million kW hours just 5 years later, before bound back to its beginning level in 1990. This figure then rose roughly two-fold to reach its peak at 720 million kW hours at the end of the observed period.
In 1980, there were around 210 million kW hours of electricity using the coal supply, compared with 100 million kW hours produced by natural gas. Afterwards, the amount of natural gas remained lower than the other for ten years before surpassed coal figure in 1990. During the next decade, the former underwent a remarkable growth of 300 million kW hours to top out at 500 million kW hours in 2000. Meanwhiles, coal generated a relatively stable amount of nearly 200 million kW hours in the period, making it end up at the lowest rank among the researched sources.