The provided line graph illustrates the expenditure of U.S. government on five major scientific research activities including Health, Space, Energy, General Science and Other over 30 years, from 1980 to 2008. Overall, the most highlighted growth belonged to Health and the lowest contribution was the sector of General Science, whose position remained unchanged throughout the given timeframe.
To begin with, in 1980, Health and Other were invested most significantly, being the same point of approximately 8 billion and 7 billion dollars at the beginning. However, the data on Health still led to be the most prominent factor, which reached a peak in 2004 of about 22 billion dollars although it once fluctuated wildly in 1984. Noticeably, despite of the substantial difference at the beginning of Other sector, Space and Energy whose ranks were second, third and fourth respectively, the Government paid more attention to Space research leading to remarkable changes, which showed the expenditure on Space was close to 10 billion dollars, being the second position at the end of period, while Other fields plummeted to the least vitality with 5 billion dollars only in 2008.
Finally, General Science made the smallest contribution with minimal growth over the 30-year period, consistently maintaining an expenditure of approximately $5 billion from 2000 to 2008.