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Table 1. 
Summary of base WoS Analytical data set. Only publications of type Article with at least two references and references with complete publication data were selected for this data set. The number of unique publications of type Article, unique references (ur), total references (tr), and the ratio of total references to unique references increases monotonically with each year indicating that both the number of documents and citation activity increase over time.
YearUnique publicationsUnique references (ur)Total references (tr)tr/ur
1985 391,860 2,266,584 5,588,861 2.47 
1986 402,309 2,316,451 5,708,796 2.46 
1987 412,936 2,427,347 5,998,513 2.47 
1988 426,001 2,545,647 6,354,917 2.50 
1989 443,144 2,673,092 6,749,319 2.52 
1990 458,768 2,827,517 7,209,413 2.55 
1991 477,712 2,977,784 7,729,776 2.60 
1992 492,181 3,134,109 8,188,940 2.61 
1993 504,488 3,278,102 8,676,583 2.65 
1994 523,660 3,458,072 9,255,748 2.68 
1995 537,160 3,680,616 9,875,421 2.68 
1996 663,110 4,144,581 11,641,286 2.81 
1997 677,077 4,340,733 12,135,104 2.80 
1998 693,531 4,573,584 12,728,629 2.78 
1999 709,827 4,784,024 13,280,828 2.78 
2000 721,926 5,008,842 13,810,746 2.76 
2001 727,816 5,203,078 14,261,189 2.74 
2002 747,287 5,464,045 15,001,390 2.75 
2003 786,284 5,773,756 16,024,652 2.78 
2004 826,834 6,095,594 17,167,347 2.82 
2005 886,648 6,615,824 19,036,324 2.88 
YearUnique publicationsUnique references (ur)Total references (tr)tr/ur
1985 391,860 2,266,584 5,588,861 2.47 
1986 402,309 2,316,451 5,708,796 2.46 
1987 412,936 2,427,347 5,998,513 2.47 
1988 426,001 2,545,647 6,354,917 2.50 
1989 443,144 2,673,092 6,749,319 2.52 
1990 458,768 2,827,517 7,209,413 2.55 
1991 477,712 2,977,784 7,729,776 2.60 
1992 492,181 3,134,109 8,188,940 2.61 
1993 504,488 3,278,102 8,676,583 2.65 
1994 523,660 3,458,072 9,255,748 2.68 
1995 537,160 3,680,616 9,875,421 2.68 
1996 663,110 4,144,581 11,641,286 2.81 
1997 677,077 4,340,733 12,135,104 2.80 
1998 693,531 4,573,584 12,728,629 2.78 
1999 709,827 4,784,024 13,280,828 2.78 
2000 721,926 5,008,842 13,810,746 2.76 
2001 727,816 5,203,078 14,261,189 2.74 
2002 747,287 5,464,045 15,001,390 2.75 
2003 786,284 5,773,756 16,024,652 2.78 
2004 826,834 6,095,594 17,167,347 2.82 
2005 886,648 6,615,824 19,036,324 2.88 
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