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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 populations of three different types of wild bird species in the United Kingdom—Coastal species, Woodland species, and Farmland species—measured in thousands from 1970 to 2004. Overall, the population of Coastal birds increased, while the populations of Farmland and Woodland species declined. Nonetheless, the overall figures for all species remained relatively stable over time, despite fluctuations in their numbers.
From 1970 to 1988, Coastal species exhibited the highest growth rate, increasing dramatically from 10 thousand in 1970 to 13 thousand in 1988. In contrast, Farmland species experienced the most significant decline during this period, dropping from 10 thousand in 1970 to 7 thousand in 1988, despite a slight rise between 1970 and 1979. Woodland species saw a minimal increase in the same timeframe, followed by a zigzag pattern until 1988, with a drop from 10 thousand in 1970 to 9 thousand in 1988.
After 1991, the populations of Woodland and Coastal bird species remained stable until 2004, showing neither an increase nor a decrease. However, Farmland species continued to decline during this period, reaching a low of 5 thousand in 2004. Despite the significant fluctuations observed in all species, the overall population numbers from 1970 to 2004 remained nearly consistent.
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