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1968 23 4 4 589–609 1972 27 2 2 399–417 CNBV 2014 2012 18 19–40 1941 1936 7 2 2 179–188 1998 69–81 1997 160 523–541 1978 30 371–448 2007 33 4 4 847–856 1993 5 1 1 35–43 2005 42 8 8 1095–1104 1992 86 1998 2004 1974 29 449–470 1963 58 799–806 1983 1 2 2 101–114 1994 42 589–613 1992 2002 2004 1999 388–401