Knowledge Framework and Evolution of Fuzzy Portfolio Research: A Bibliometric Analysis

Table 7

Top 20 most productive countries.

Country	Frequency	Centrality	Year
The People’s Republic of China	199	0.32	2002
Iran	79	0.26	2008
Spain	53	0.43	2001
Taiwan	46	0.08	2004
India	43	0.05	2008
United States	42	0.31	1996
Japan	36	0.06	1998
Turkey	22	0.01	2005
Australia	19	0.04	2005
Canada	17	0.22	2000
Romania	16	0.02	1999
England	15	0.12	2002
Germany	15	0.02	1999
Brazil	14	0.00	2012
France	12	0.10	2009
Italy	11	0.11	2006
Mexico	11	0.00	2002
Lithuania	10	0.01	2012
Poland	9	0.01	2012
Finland	8	0.01	2009