the line graph illustrates the amount of supplies transported across the UK between 1974 and 2002, which is divided in four different types of transport.
According to the data provided by the graph, there are four transportation methods, including, road, water, rail and water. Among these four, the highest amount of transportation was through roads, and pipeline was the least used mode throughout the years.
Starting with the greatest, road transportation experienced a steady increase, starting from 70 million tons in 1974, it has been rising ever since. Although, there was an ignorable drop in 1982 (dropped to less than 70 million tons), it again increased steadily between 1982 and 1994. Moreover, there was a significant jump between 1995 and 1998 (reaching approximately 100 million tons). Water however, experienced a rather stable trend compared to others. Even though it jumped from 40 million tons to almost 60 million tons between 1978 and 1982, it remained steady from 1982 to 1998 at 60 million tons.
Thirdly, Railway transportation was the most different compared to others, in terms of trends. It fluctuated during 1974 and 1994, from 30 to 40 million tons. However, in 1995 there was a notable decline reaching its lowest, at just above 20 million tons. And finally, although pipeline transportation was the least used method of transportation, it had a similar trend compared to water. Starting from just above 0 million tons in 1974 it had risen constantly and reached at almost 20 million tons in 1982. While it remained constant between 1982 and 1990, it had a small rise (passing 20 million mark), in 1994. Since then, it again experienced a steady trend.