Optimization of Tennis Teaching Resources and Data Visualization Based on Support Vector Machine

Table 6

Basic status of tennis research literature.

Year	Core volume	Cumulative amount	Total	Percentage	Year	Core volume	Cumulative amount	Total	Percentage
1992	8	9	60	14.74	2005	19	109	207	9.65
1993	4	14	55	8.92	2006	17	127	237	7.58
1994	3	18	107	3.73	2007	30	158	340	9.11
1995	17	36	105	17.91	2008	31	190	431	7.41
1996	7	44	124	6.39	2009	29	220	511	5.86
1997	2	47	116	2.55	2010	40	261	625	6.71
1998	1	49	131	1.51	2011	45	307	666	6.90
1999	7	57	134	5.92	2012	42	350	673	6.38
2000	9	67	98	10.09	2013	47	398	733	6.67
2001	5	73	103	5.76	2014	34	433	773	4.52
2002	7	81	109	7.26	2015	27	461	766	3.91
2003	2	84	160	1.85	2016	28	490	620	4.67
2004	4	90	173	3.41	2017	16	507	578	3.28
Total							506	9091	5.66