| Kr. prosté | % | Abs. č. |
| 1977 | 70 | 14 569 |
| 1978 | 72 | 15 093 |
| 1979 | 70 | 14 579 |
| 1980 | 67 | 15 020 |
| 1981 | 65 | 16 055 |
| 1982 | 63 | 18 212 |
| 1983 | 63 | 16 533 |
| 1984 | 64 | 17 527 |
| 1985 | 63 | 17 369 |
| 1986 | 63 | 17 689 |
| 1987 | 62 | 18 259 |
| 1988 | 59 | 17 658 |
| 1989 | 56 | 17 647 |
| 1990 | 23 | 19 564 |
| 1991 | 19 | 21 320 |
| 1992 | 18 | 27 106 |
| 1993 | 18 | 32 226 |
| 1994 | 19 | 32 839 |
| 1995 | 22 | 36 876 |
| 1996 | 22 | 38 594 |
| 1997 | 22 | 39 289 |