Table 2.

General characteristics of publications.

Year Published	Total Number of Papers	Total Citations	Mean Cite Rate Per Year	Total Usage * Last 6 Months	Total Usage * Last 5 Years	Mean Use Rate ** Last 6 Months	Mean Use Rate ** Last 5 Years
2018	2333	2032	0.87	7750	12,590	3.32	1.08
2017	2147	8532	1.99	3507	20,822	1.63	1.94
2016	2147	15,174	2.36	2704	30,954	1.26	2.88
2015	2103	28,147	3.35	2363	36,240	1.12	3.45
2014	1838	29,916	3.26	1597	33,525	0.87	3.65
2013	1560	36,230	3.87	1140	35,573	0.73	4.56
2012	1459	38,440	3.76	976	27,891	0.67	3.82
2011	1432	42,896	3.74	998	22,267	0.70	3.11
2010	852	33,522	4.37	508	11,302	0.60	2.65
2009	963	39,974	4.15	541	11,023	0.56	2.29
2008	812	39,424	4.41	425	9002	0.52	2.22
2007	668	38,459	4.80	323	8008	0.48	2.40
2006	529	35,718	5.19	284	7142	0.54	2.70
2005	415	32,184	5.54	188	4187	0.45	2.02
2004	307	22,925	4.98	126	3368	0.41	2.19
2003	254	21,127	5.20	99	2187	0.39	1.72
2002	187	16,138	5.08	97	1778	0.52	1.90
2001	151	14,033	5.16	82	2160	0.54	2.86
2000	141	10,951	4.09	96	1610	0.68	2.28
1999	130	11,093	4.27	72	1226	0.55	1.89
1998	117	10,223	4.16	51	1155	0.44	1.97
1997	87	4801	2.51	13	448	0.15	1.03
1996	65	3886	2.60	10	336	0.15	1.03
1995	60	4438	3.08	13	315	0.22	1.05
1994	36	2212	2.46	11	153	0.31	0.85
1993	51	2475	1.87	10	167	0.20	0.65
1992	43	1639	1.41	10	113	0.23	0.53
1991	38	1634	1.54	10	104	0.26	0.55

* Total usage: Total number of downloads. ** Mean use rate: Total number of downloads/Total number of papers.