Table 3 Annual distribution of publications

1992

1

47

47

1

1

62

62

1

1993

2

4

2

1

2

8

4

2

1994

1

16

16

1

2

19

9.5

1

1996

1

30

30

1

3

38

12.7

1

1997

3

118

39.3

3

3

138

46

3

1998

–

–

–

–

1

8

8

1

2004

1

16

16

1

–

–

–

–

2006

1

32

32

1

1

34

34

1

2007

2

23

11.5

2

3

400

133

2

2008

2

92

46

2

5

171

34.2

4

2009

3

170

56.7

3

6

184

30.7

3

2010

14

733

52.4

9

16

818

51.1

10

2011

13

508

39.1

10

10

518

51.8

8

2012

15

356

23.7

7

13

382

29.4

7

2013

20

453

22.7

10

21

488

23.2

11

2014

34

126

3.71

7

16

142

8.88

8

2015

37

415

11.2

13

33

397

12

13

2016

34

135

3.97

6

24

140

5.83

6

2017

38

134

3.53

7

23

82

3.57

5

2018

54

142

2.63

7

32

129

4.03

7

2019

41

23

0.56

3

37

25

0.68

3