date (gmt)  yield (megatons)          deployment       country      test site         name or number
0     october 30 , 1961              50.0  parachute air drop  soviet union  novaya zemlya  tsar bomba , test 130
1    december 24 , 1962              24.2            air drop  soviet union  novaya zemlya               test 219
2       august 5 , 1962              21.1            air drop  soviet union  novaya zemlya               test 147
3   september 27 , 1962              20.0            air drop  soviet union  novaya zemlya               test 174
4   september 25 , 1962              19.1            air drop  soviet union  novaya zemlya               test 173
5    february 28 , 1954              15.0              ground           usa   bikini atoll           castle bravo
6          may 4 , 1954              13.5               barge           usa   bikini atoll          castle yankee
7     october 23 , 1961              12.5            air drop  soviet union  novaya zemlya               test 123
8       march 26 , 1954              11.0               barge           usa   bikini atoll           castle romeo
9     october 31 , 1952              10.4              ground           usa       eniwetok               ivy mike
10     august 25 , 1962              10.0            air drop  soviet union  novaya zemlya               test 158

Table as JSON:
{"date (gmt)":{"0":"october 30 , 1961","1":"december 24 , 1962","2":"august 5 , 1962","3":"september 27 , 1962","4":"september 25 , 1962","5":"february 28 , 1954","6":"may 4 , 1954","7":"october 23 , 1961","8":"march 26 , 1954","9":"october 31 , 1952","10":"august 25 , 1962"},"yield (megatons)":{"0":50.0,"1":24.2,"2":21.1,"3":20.0,"4":19.1,"5":15.0,"6":13.5,"7":12.5,"8":11.0,"9":10.4,"10":10.0},"deployment":{"0":"parachute air drop","1":"air drop","2":"air drop","3":"air drop","4":"air drop","5":"ground","6":"barge","7":"air drop","8":"barge","9":"ground","10":"air drop"},"country":{"0":"soviet union","1":"soviet union","2":"soviet union","3":"soviet union","4":"soviet union","5":"usa","6":"usa","7":"soviet union","8":"usa","9":"usa","10":"soviet union"},"test site":{"0":"novaya zemlya","1":"novaya zemlya","2":"novaya zemlya","3":"novaya zemlya","4":"novaya zemlya","5":"bikini atoll","6":"bikini atoll","7":"novaya zemlya","8":"bikini atoll","9":"eniwetok","10":"novaya zemlya"},"name or number":{"0":"tsar bomba , test 130","1":"test 219","2":"test 147","3":"test 174","4":"test 173","5":"castle bravo","6":"castle yankee","7":"test 123","8":"castle romeo","9":"ivy mike","10":"test 158"}}