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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 illustrates the changes in population of various bird types beetween the years 1970 and 2004 in the UK. The starting figure is considered to be 100 for all 4 types.
Generally speaking, it can be clearly seen that the numbers of coastal and farmland species experienced significantly larger alterations than the other 2 types.
Turning into details, the number of coastal birds was rising steadily from 100 to about 130 in 1985, later shifting beetween 130 and 140 for almost 2 decades. Farmland birds, on the other hand, only increased to 110 in the first 7 years, before falling dramatically below 60.
Furthermore, the quantities of Woodland and other spieces were constantly fluctuating in rather similar patterns throught the entire period, with only a small gap existing until approximately 1988, widening up in the following years. By 2004, woodland bird population dropped to roughly 90, while the other category reached 110.
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