Table 2.

General characteristics of publications.

Year Published	Total Number of Papers	Total Citations	Mean Cite Rate per Year	Total Usage Last 6 Month	Total Usage Last 5 Years	Mean Use Rate Last 6 Month	Mean Use Rate Last 5 Year
2018	314	197	0.6	562	822	1.8	0.5
2017	295	1763	3.0	356	1756	1.2	1.2
2016	306	1946	2.1	254	2055	0.8	1.3
2015	270	3311	3.1	219	2198	0.8	1.6
2014	284	5101	3.6	177	2753	0.6	1.9
2013	234	3970	2.8	128	2451	0.5	2.1
2012	199	4653	3.3	78	1825	0.4	1.8
2011	189	6880	4.6	90	1424	0.5	1.5
2010	144	5733	4.4	75	1146	0.5	1.6
2009	128	5719	4.5	61	823	0.5	1.3
2008	127	6549	4.7	36	819	0.3	1.3
2007	109	5158	3.9	33	492	0.3	0.9
2006	107	6800	4.9	28	514	0.3	1.0
2005	86	4625	3.8	37	422	0.4	1.0
2004	75	5445	4.8	30	448	0.4	1.2
2003	62	6317	6.4	20	385	0.3	1.2
2002	56	5847	6.1	15	257	0.3	0.9
2001	40	2757	3.8	3	157	0.1	0.8
2000	43	5670	6.9	28	324	0.7	1.5
1999	28	1612	2.9	6	112	0.2	0.8
1998	32	3324	4.9	14	196	0.4	1.2
1997	29	2223	3.5	8	146	0.3	1.0
1996	18	2275	5.5	3	91	0.2	1.0
1995	16	1681	4.4	9	80	0.6	1.0
1994	10	1060	4.2	0	40	0.0	0.8
1993	12	559	1.8	4	20	0.3	0.3
1992	9	420	1.7	2	14	0.2	0.3
1991	7	426	2.2	0	11	0.0	0.3