Statistics
| Year | Singing | |
|---|---|---|
| Not available | 6 | - |
| 1969 | 4 | - |
| 1970 | 13 | - |
| 1971 | 25 | - |
| 1972 | 32 | - |
| 1973 | 62 | - |
| 1974 | 52 | - |
| 1975 | 51 | - |
| 1976 | 52 | - |
| 1977 | 66 | - |
| 1978 | 39 | - |
| 1979 | 26 | - |
| 1980 | 34 | - |
| 1981 | 17 | - |
| 1982 | 10 | - |
| 1983 | 20 | - |
| 1984 | 11 | - |
| 1985 | 5 | - |
| 1986 | 11 | - |
| 1987 | 3 | - |
| 1988 | 4 | - |
| 1992 | 5 | - |
| 1994 | 4 | - |
| 1995 | 1 | - |
| 1996 | 2 | - |
| 2002 | 1 | - |