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- 25 Development
- 18 Growth
- 18 Political
- 17 Analysis
- 14 Social
- 13 Policy
- 12 Agricultural
- 12 Agriculture
- 11 Historical
- 10 Population
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Year Completed
- 67 2010 - 2017
- 103 2000 - 2009
- 54 1990 - 1999
- 22 1980 - 1989
- 11 1970 - 1979
- 10 1960 - 1969
- 1 1957 - 1959