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Table 10
Number of Authors, by Decade
 decade1970s1980s1990s2000s2010stotal
Single author Freq. 149 163 127 95 61 595 
Percent 87.1 82.3 80.9 76.0 47.7 76.4 
Two authors Freq. 15 29 26 24 34 128 
Percent 8.8 14.7 16.6 19.2 26.6 16.4 
Three or more authors Freq. 33 56 
Percent 4.1 3.0 2.6 4.8 25.8 7.2 
Total   171 198 157 125 128 779 
 decade1970s1980s1990s2000s2010stotal
Single author Freq. 149 163 127 95 61 595 
Percent 87.1 82.3 80.9 76.0 47.7 76.4 
Two authors Freq. 15 29 26 24 34 128 
Percent 8.8 14.7 16.6 19.2 26.6 16.4 
Three or more authors Freq. 33 56 
Percent 4.1 3.0 2.6 4.8 25.8 7.2 
Total   171 198 157 125 128 779 
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