The two pie charts Compare the 
percentage
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phdsience
, masters Correct your spelling
presence
science
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first
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science
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working
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the working
a working
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degree
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degrees
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 1980 and 2008.
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percentage
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first 
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first-degree
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 period Add a hyphen
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this
 figure for Linking Words
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first 
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science
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first
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degree
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however
, by 2008 the figure for Linking Words
this
 category had fallen by 11% . Linking Words
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terms
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this
 category made up 19% in 1980 and after 28 year Change preposition
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 28%.The smallest Change preposition
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 5 
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