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The image features a line graph titled "Population of wild birds: 1970-2004" focusing on the United Kingdom, plotting indices for four bird population categories, depicted over the years 1970 to 2004. The vertical axis ranges from 50 to 140 (index = 1970 = 100), and the horizontal axis represents time. Each category's bird population is represented by a specific line: Coastal species (20 species), All species (111 species), Woodland species (33 species), and Farmland species (19 species). Initially, in 1970, all categories start at an index of 100. Patterns vary distinctly among categories through years:
1. Coastal species index shows a fairly steady increase, starting at 100 in 1970, dipping slightly in the early 1970s, then climbing gradually, reaching around 120 in 2004.
2. All species index begins at 100 in 1970, decreases slightly to below 100 by 1976, fluctuates mildly around this range, and ends near 100 again in 2004.
3. Woodland species index starts at 100 in 1970, exhibits some fluctuation, dipping to approximately 90 by mid-1970s, recovering to 100 by 1980, with slight rises and falls, ending just below 100 by 2004.
4. Farmland species index begins at 100, shows a sharp decline to about 60 by mid-1980s, and maintains a relatively flat trend but slightly recuperates, closing near 70 in 2004.
Given the complexity of the image, the above description may not be entirely accurate.
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The graph illustrates the percentage of the number of three types of birds: coastal, woodland and farmland and their total sum, that inhabited the UK between 1970 and 2004.
Overall, the initial impression from the graph is that only the coastal species followed an upward direction, while the other species showed a significant decrease.
The coastal population raised gradually over the first half of the given period, however, from 1997 to 2004, the level fluctuated. The figure peaked at approximately 140 percent four times, but had reached 135 by 2004.
By contrast, the opposite downward trend was shown by the farmland and the woodland species. The amount of woodland species had changed the least, with approximately 85% by 2004. Despite the fluctuation and decline over the most of the period, there was an upward trend between 1992 and 2004. The total sum of farmland birds had decreased by almost 2 times by 2004. It peaked at 110 birds in 1977 before falling sharply in 1979. The number had dropped dramatically by 1992 but for the last 5 years the scale decreased slightly.
Despite the fluctuating tendency, the total number of the birds had increased in comparison to 1970.
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