Numbers by edition
* starting from 2008: first number = official race - second number = open races
| Year | Swimmers | Men | Women | At the finish | Nations |
| 2025 * | 53 (18+35) | 42 (12+30) | 11 (6+5) | 40 (17+23) | 13 (8+5) |
| 2024 * | 43 (20+23) | 35 (15+20) | 8 (5+3) | 33 (16+17) | 19 (11+8) |
| 2023 * | 39 (20+19) | 27 (15+12) | 12 (5+7) | 35 (19+16) | 13 (6+7) |
| 2022 * | 36 (17+19) | 31 (14+17) | 5 (3+2) | 8 (0**+8) | 15 (6+9) |
| 2021 * | 38 (27+11) | 24 (15+9) | 14 (12+2) | 27 (22+5) | 11 (9+2) |
| 2020 * | 17 (12+5) | 11 (7+4) | 6 (5+1) | 14 (12+2) | 7 (5+2) |
| 2019 * | 36 (23+13) | 22 (13+9) | 14 (10+4) | 29 (11+8) | 9 (7+2) |
| 2018 * | 39 (20+19) | 32 (15+17) | 7 (5+2) | 23 (16+7) | 11 (10+1) |
| 2017 * | 38 (29+9) | 21 (17+4) | 17 (12+5) | 25 (18+7) | 11 (8+3) |
| 2016 * | 38 (27+11) | 24 (15+9) | 14 (12+2) | 24 (23+1) | 15 (10+5) |
| 2015 * | 36 (26+10) | 25 (16+9) | 11 (10+1) | 29 (22+7) | 15 (12+3) |
| 2014 * | 47 (30+17) | 35 (20+15) | 12 (10+2) | 28 (24+4) | 19 (17+2) |
| 2013 * | 29 (22+7) | 21 (14+7) | 8 | 20 (20+0) | 14 (12+2) |
| 2012 * | 32 (28+4) | 21 (18+3) | 11 (10+1) | 24 (16+8) | 18 (15+3) |
| 2011 * | 25 (21+4) | 16 (13+3) | 9 (8+1) | 18 (17+1) | 12 (10+2) |
| 2010 * | 21 (20+1) | 13 (12+1) | 8 | 16 | 10 (9+1) |
| 2009 * | 25 (23+2) | 16 (15+1) | 9 (8+1) | 21 (20+1) | 9 (8+1) |
| 2008 * | 23 (22+1) | 12 (11+1) | 11 | 17 | 11 |
| 2007 | 15 | 9 | 6 | 13 | 8 |
| 2006 | 17 | 10 | 7 | 14 | 10 |
| 2005 | 26 | 17 | 9 | 20 | 13 |
| 2004 | 30 | 19 | 11 | 27 | 13 |
| 2003 | 32 | 19 | 13 | 29 | 16 |
| 1993-2002 Not held | |||||
| 1992 | 46 | 28 | 18 | 39 | 18 |
| 1991 | 47 | 29 | 18 | 37 | 20 |
| 1990 | 51 | 33 | 18 | 44 | 24 |
| 1989 | 36 | 23 | 13 | 32 | 18 |
| 1988 | 45 | 34 | 11 | 27 | 22 |
| 1987 | 37 | 28 | 9 | 30 | 18 |
| 1986 | 16 | 12 | 4 | 13 | 11 |
| 1984-1985 Not held | |||||
| 1983 | 22 | 19 | 3 | 9 | 13 |
| 1982 | 23 | 19 | 4 | 19 | 12 |
| 1981 | 36 | 32 | 4 | 22 | 16 |
| 1980 | 31 | 26 | 5 | 23 | 14 |
| 1979 | 23 | 20 | 3 | 18 | 16 |
| 1978 | 28 | 25 | 3 | 11 | 13 |
| 1977 | 27 | 23 | 4 | 25 | 12 |
| 1976 | 26 | 21 | 5 | 16 | 12 |
| 1975 | 30 | 23 | 7 | 25 | 13 |
| 1974 | 28 | 23 | 5 | 25 | 12 |
| 1973 | 30 | 26 | 4 | 14 | 14 |
| 1972 | 16 | 13 | 3 | 10 | 11 |
| 1971 | 32 | 30 | 2 | 24 | 14 |
| 1970 | 31 | 28 | 3 | 23 | 12 |
| 1969 | 25 | 21 | 4 | 4 | 13 |
| 1968 | 20 | 16 | 4 | 18 | 10 |
| 1967 | 14 | 9 | 5 | 10 | 9 |
| 1966 | 21 | 16 | 5 | 12 | 10 |
| 1965 | 18 | 14 | 4 | 12 | 9 |
| 1964 | 17 | 14 | 3 | 7 | 11 |
| 1963 | 24 | 21 | 3 | 22 | 12 |
| 1962 | 19 | 16 | 3 | 13 | 11 |
| 1961 | 18 | 14 | 4 | 10 | 11 |
| 1960 | 20 | 15 | 5 | 7 | 13 |
| 1959 | 25 | 21 | 4 | 18 | 14 |
| 1958 | 34 | 29 | 5 | 17 | 16 |
| 1957 | 17 | 13 | 4 | 13 | 9 |
| 1956 | 17 | 15 | 2 | 6 | 9 |
| 1955 | 17 | 13 | 4 | 13 | 10 |
| 1954 | 10 | 10 | 0 | 6 | 8 |