Table 1. The annual journal productivity based on the volume number, issues in each volume, articles in each issue, and total articles published each year from 1987 to 2018.

Year	Volume	Issue				Number of articles for each issue				Total
1987	1	1				16				16
1988	2	1		2	3	15		18	14	47
1989	2	4				15				45
	3	1&2		3&4		18		12
1990	4	1	2	3	4	12	12	11	11	46
1991	5	1&2		3&4		14		19		33
1992	6	1		2	3	15		15	14	44
1993	6	4				18				61
	7	1		2	3	15		12	16
1994	7	4				10				49
	8	1		2	3	15		14	10
1995	8	4				14				57
	9	1		2	3	12		14	17
1996	9	4				18				67
	10	1		2	3	19		12	18
1997	10	4				14				74
	11	1		2	3	19		22	19
1998	11	4				22				83
	12	1		2	3	20		24	17
1999	12	4				17				64
	13	1		2	3	15		17	15
2000	13	4				16				80
	14	1		2	3	22		18	24
2001	14	4				23				57
	15	1		2	3	11		11	12
2002	15	4				11				49
	16	1		2	3	13		13	12
2003	16	4				14				64
	17	1		2	3	16		16	18
2004	17	4				17				70
	18	1		2	3	18		18	17
2005	18	4				19				69
	19	1		2	3	18		15	17
2006	19	4				16				50
	20	1		2	3	12	10		12
2007	20	4				12				42
	21	1		2	3	10		10	10
2008	21	4				10				40
	22	1		2	3	10		10	10
2009	22	4				10				40
	23	1		2	3	10		10	10
2010	23	4				10				41
	24	1		2	3	10		10	11
2011	24	4				11				48
	25	1	2	3	4	9	9	10	9
2012	26	1	2	3	4	8	9	10	9	36
2013	27	1	2	3	4	9	9	11	13	42
2014	28	1				158				158
2015	29	1				154				154
2016	30	1				166				166
2017	31	1				139				139
2018	32	1				135				135