Table: sistema de radiodifusoras culturales indigenistas
[['call sign', 'launched', 'transmitting from', 'coverage', 'languages', 'frequency'], ['xezv', '10 may 1979', 'guerrero ( tlapa de comonfort )', 'guerrero oaxaca puebla', 'nahuatl mixtec tlapanec', '800 am'], ['xetla', '15 september 1982', 'oaxaca ( tlaxiaco )', 'oaxaca guerrero puebla', 'mixtec triqui', '930 am'], ['xepur', '2 october 1982', 'michoacán ( cherán )', 'michoacán', 'purepecha', '830 am'], ['xetar', '11 november 1982', 'chihuahua ( guachochi )', 'chihuahua sinaloa durango', 'tarahumara tepehuano', '870 am'], ['xepet', '29 november 1982', 'yucatán ( peto )', 'yucatán quintana roo campeche', 'yucatec maya', '730 am'], ['xevfs', '27 april 1987', 'chiapas ( las margaritas )', 'chiapas guatemala', 'tojolabal mam tseltal tsotsil popti', '1030 am'], ['xeant', '28 september 1990', 'san luis potosí ( tancanhuitz de santos )', 'san luis potosí hidalgo querétaro veracruz', 'nahuatl pame wastek', '770 am'], ['xeglo', '18 november 1990', 'oaxaca ( guelatao de juárez )', 'oaxaca veracruz', 'zapotec mixe chinantec', '780 am'], ['xezon', '20 november 1991', 'veracruz ( zongolica )', 'veracruz oaxaca puebla tlaxcala', 'nahuatl', '1360 am'], ['xeojn', '14 december 1991', 'oaxaca ( san lucas ojitlán )', 'oaxaca puebla veracruz', 'mazatec cuicatec chinantec', '950 am'], ['xejmn', '3 april 1992', 'nayarit ( jesús maría )', 'nayarit jalisco durango zacatecas', 'cora huichol tepehuano nahuatl', '750 am'], ['xejam', '5 may 1994', 'oaxaca ( santiago jamiltepec )', 'oaxaca guerrero', 'mixtec amuzgo chatino', '1260 am'], ['xeqin', '15 june 1994', 'baja california ( san quintín )', 'baja california', 'mixtec zapotec triqui', '1160 am'], ['xectz', '21 august 1994', 'puebla ( cuetzalan )', 'puebla hidalgo veracruz', 'nahuatl totonac', '1260 am'], ['xexpuj', '22 january 1996', 'campeche ( xpujil )', 'campeche quintana roo', "yucatec maya ch'ol", '700 am'], ['xeetch', '19 february 1996', 'sonora ( etchojoa )', 'sonora sinaloa chihuahua', 'mayo yaqui guarijio', '700 am'], ['xecopa', '17 july 1997', 'chiapas ( copainalá )', 'chiapas tabasco', 'zoque tzotzil', '1210 am'], ['xetumi', '12 may 1998', 'michoacán ( tuxpan )', 'michoacán edo de méxico querétaro', 'mazahua otomi', '1010 am'], ['xecarh', '1 august 1998', 'hidalgo ( cardonal )', 'hidalgo querétaro veracruz san luis potosí', 'ñha - ñhu nahuatl', '1480 am'], ['xenka', '15 june 1999', 'quintana roo ( felipe carrillo puerto )', 'quintana roo', 'yucatec maya', '1030 am']]
Statement: most of the radio station are Transmitting From Oaxaca
Statement: 20 radio station were Launched between 1979 and 1999
Statement: during 1994 the most number of radio station were Launched compared to other year
Statement: the longest gap of time between launching of radio station was 3 year
Statement: the 2 radio station Launched in 1996 had the same Frequency