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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 line graph delineates the proportion of various bird species in the UK from 1970 to 2004.
Overall, it it obvious from the chart that the population index of all types of bird began in the same point, in which, the number of coastal species witnessed a dramatic rise over this period, while the figure of farmland species moved downwards.
In detail, all kind of species accounted for 100 birds, in 1970. The proportion of coastal species escalated significantly (around 130 birds in 1986), before reaching its peak in 1991 (about 140) and finishing at around 135 birds in the final year. Likewise, the total number of species experienced flactuation, after which, it soared slightly to approximatelly 110, by 2004.
In contrast, all the rest species faced decrease. The number of woodland and farmland species increased to 110 birds in the beginning of the period, after which, both of them dwindled dramatically. The figure of woodland species accounted for about 90 birds, while the same for farmland species was merely 60 birds, in 2004.
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