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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 data about the number of birds divided to three species: Coastal, Woodland and Farmland , and their total sum inhabiting the UK between 1970 to 2004.
Overall, the initial impression from the graph is that although all of the species started at the equal number, only Costal species followed an upward trend while the quantity of the rest of the species decreased significantly. In general the total sum of all the species showed growth between 1970, but between 1980 and 1998 there was an downward trend. Since 1998 the figure started climbing up more stable.
The number of Costal birds showed the most noticeable growth. It followed the stable growth over the fiкst time of the given period of time, but by contrast, since 1997 the graph fluctuated. It had reached the same peak values at approximately 140 birds by 1996, 1992, 1998 and 2003, but between 1993 and 1996 there was a minor decrease at about 135 birds in 1994. By 2004 the number had showed an downward trend.
The opposite downwards trend showed Farmland species. The number of birds had declined dramatically by 2004. It reached its maximum to about 110 birds in 1979 before falling sharply in 1978. Since then the figure had been falling down when there was a slight increase between 1989 and 1991, but there was a steep drop in 1992. The number of Woodland species fluctuated the major part of the time. The the biggest figure at about 110 birds was at the beginning of the period, and the smallest value at about 85 birds in 1992. By contrast from 1992 to 2004 it showed slight changes with peak at aproximately 90 in 2000.
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