Please evaluate my Ielts writing tak 1 essay ( Line graph ). Thank you so much

The graph below shows the number of passenger railway journeys made in Great Britain between 1950 and 2004/5.

Summarize the information by selecting and reporting the main features and make comparisons where relevant. Write at least 150 words.

The line graph compares statistics for railway journeys usage by passengers in Great Britain in using three different types of the railway system over a period of 55 years, from 1950 to 2005.
It is clear that the trends for all means were very similar; however, Light rail & metro system is the least popular. While the number of commuters using London Underground and National rail network rose considerably between 1980 and 2005, there was a slight growth of Light rail & metro systems.
In 1950, there were 1000 million of people used National rail network and 700 million using London Underground. After that, Light rail & metro systems started operating in 1963 with approximately 30 million users. Then, in 1980, most of the passengers did not use Light rail & metro systems. By 1982, number of people who used National rail netwprk and London Underground dropped significantly to nearly 600 million and 500 million respectively.
From 1982 to 1985, the number of people commuted by all 3 kinds of railway experienced a moderate recovery, with both National rail network and London Underground achieved approximately 800 million passengers and Light rail & metro systems got about 70 million passengers. However,in 1995, the number of people who used National rail network and London Underground fell by 50 million, whereas the Light rail & metro systems's remain stably at 70 million passengers. Finally, in 2004/5, all means of railway increased once again, at 900 million, 1070 million and 170 million respectively.