Table 7.
The most productive countries in number of articles (1970–2019).
| Country | A | TC | TC/A | h-Index | R (A) | ||||
|---|---|---|---|---|---|---|---|---|---|
| 1970–1979 | 1980–1989 | 1990–1999 | 2000–2009 | 2010–2019 | |||||
| USA | 212 | 4550 | 21.46 | 34 | 1(7) | 2(1) | 1(8) | 1(25) | 1(171) |
| UK | 87 | 1640 | 18.85 | 20 | 0 | 0 | 2(2) | 2(17) | 3(68) |
| China | 85 | 388 | 4.56 | 11 | 0 | 0 | 0 | 7(3) | 2(82) |
| Spain | 62 | 921 | 14.85 | 11 | 0 | 0 | 0 | 6(4) | 4(58) |
| Canada | 32 | 1161 | 36.28 | 13 | 0 | 0 | 4(1) | 3(6) | 7(25) |
| Australia | 28 | 307 | 10.96 | 9 | 0 | 0 | 0 | 16(1) | 5(27) |
| Germany | 27 | 987 | 36.56 | 15 | 0 | 0 | 0 | 8(3) | 8(24) |
| India | 27 | 81 | 3 | 6 | 0 | 0 | 0 | 0 | 6(27) |
| Italy | 23 | 203 | 8.83 | 7 | 0 | 0 | 0 | 20(1) | 9(22) |
| Japan | 21 | 276 | 13.14 | 9 | 0 | 0 | 6(1) | 5(5) | 16(15) |
A: number of articles; R: rank position by number of articles; TC: number of citations for all articles; TC/A: number of citations by article; h-index: Hirsch index in research topic.