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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 number of population of four distinct types of birds in the UK, over 34 year-period, spanning from 1970 to 2004. Overall, all kind of birds saw fluctuations in numbers and were of the same figures at the starting of the period. Figures for coastal species outnumbered the remaining categories throughout the timeframe, while the reverse held true for farmland type of birds. The rates for all species of birds escallated between a certain range. Woodland birds, however, experienced a steady fall.
Regarding the bird species that showed an increase, coastal species beginning at 100 index point, were the ones who witnessed the most noticeable growth, roughly 20 index points increase every decade until 1988, when numbers for this species culminated and commenced to vary every year. By the final year, it remained equivalent as of 1988 at around 135 points, despite inconsistency. Birds of all types however, observed growth until 1987, after which started to witness decrease. These types varied between a range of 100 and 110 index points and constitued 110 points in the final year.
Concerning the remaining types who witnessed a downward trend, the figures for farmland birds accounted for the smallest rates starting from 100 index points, species started to increase gradually and by the final year it showed the lowest numbers at approximately 55 index points. Steady decline in the numbers of woodland species was observed, about fall of 5 index points every year, reaching its minimum by the end of the period.
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