Table 2.

General characteristics of publications.

Year Published	Total Number of Papers	Total Citations	Mean Cite Rate per Year	Total Usage Last 6 Months 1	Total Usage Last 5 Years 1	Mean Use Rate Last 6 Months 2	Mean Use Rate Last 5 Years 2
2018	74	60	0.8	405	739	5.5	2.0
2017	56	243	2.2	157	788	2.8	2.8
2016	57	400	2.3	61	656	1.1	2.3
2015	33	288	2.2	39	462	1.2	2.8
2014	22	196	1.8	29	403	1.3	3.7
2013	27	380	2.3	28	400	1.0	3.0
2012	17	135	1.1	9	117	0.5	1.4
2011	14	300	2.7	8	206	0.6	2.9
2010	12	343	3.2	8	107	0.7	1.8
2009	8	435	5.4	7	197	0.9	4.9
2008	8	291	3.3	8	75	1.0	1.9
2007	8	323	3.4	4	98	0.5	2.5
2006	8	213	2.0	9	130	1.1	3.3
2005	2	30	1.1	0	4	0.0	0.4
2004	5	321	4.3	3	56	0.6	2.2
2003	2	134	4.2	1	16	0.5	1.6
2002	5	177	2.1	0	21	0.0	0.8
2001	1	23	1.3	0	0	0.0	0.0
2000	4	44	0.6	0	10	0.0	0.5
1999	1	18	0.9	0	2	0.0	0.4
1998	2	48	1.1	0	5	0.0	0.5
1997	2	14	0.3	0	3	0.0	0.3
1996	1	22	1.0	0	4	0.0	0.8
1994	1	8	0.3	0	0	0.0	0.0
1993	1	2	0.1	0	0	0.0	0.0
1991	1	2	0.1	0	2	0.0	0.4

¹ Total usage: Total number of download; ² Use rate: Total number of downloads/Total number of papers.