| Year | 
Event | 
Status | 
Participants | 
NOCs | 
| 1924 | 
100 metres Backstroke, Women | 
Olympic | 
10 | 
5 | 
| 1928 | 
100 metres Backstroke, Women | 
Olympic | 
12 | 
7 | 
| 1932 | 
100 metres Backstroke, Women | 
Olympic | 
12 | 
7 | 
| 1936 | 
100 metres Backstroke, Women | 
Olympic | 
21 | 
12 | 
| 1948 | 
100 metres Backstroke, Women | 
Olympic | 
24 | 
16 | 
| 1952 | 
100 metres Backstroke, Women | 
Olympic | 
20 | 
14 | 
| 1956 | 
100 metres Backstroke, Women | 
Olympic | 
23 | 
14 | 
| 1960 | 
100 metres Backstroke, Women | 
Olympic | 
30 | 
19 | 
| 1964 | 
100 metres Backstroke, Women | 
Olympic | 
31 | 
17 | 
| 1968 | 
100 metres Backstroke, Women | 
Olympic | 
40 | 
23 | 
| 1972 | 
100 metres Backstroke, Women | 
Olympic | 
37 | 
21 | 
| 1976 | 
100 metres Backstroke, Women | 
Olympic | 
34 | 
21 | 
| 1980 | 
100 metres Backstroke, Women | 
Olympic | 
26 | 
18 | 
| 1984 | 
100 metres Backstroke, Women | 
Olympic | 
31 | 
21 | 
| 1988 | 
100 metres Backstroke, Women | 
Olympic | 
41 | 
30 | 
| 1992 | 
100 metres Backstroke, Women | 
Olympic | 
45 | 
31 | 
| 1996 | 
100 metres Backstroke, Women | 
Olympic | 
36 | 
30 | 
| 2000 | 
100 metres Backstroke, Women | 
Olympic | 
46 | 
39 | 
| 2004 | 
100 metres Backstroke, Women | 
Olympic | 
42 | 
35 | 
| 2008 | 
100 metres Backstroke, Women | 
Olympic | 
48 | 
37 | 
| 2012 | 
100 metres Backstroke, Women | 
Olympic | 
45 | 
38 | 
| 2016 | 
100 metres Backstroke, Women | 
Olympic | 
34 | 
29 | 
| 2020 | 
100 metres Backstroke, Women | 
Olympic | 
41 | 
34 |