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| Year | Until 10:00 | Until 12:00 | Until 14:00 | Until 16:00 | Until 18:00 | Until 20:00 | Until 22:00 |
| 1973 | 21.8 | 33.1 | 41.4 | 54.1 | 65.2 | 73.4 | 78.6 |
| 1977 | 16.8 | 31.3 | 42.4 | 50.6 | 60.2 | 71.4 | 79.2 |
| 1981 | 17.0 | 30.2 | 39.4 | 47.0 | 57.0 | 69.6 | 78.5 |
| 1984 | 15.6 | 29.8 | 39.8 | 47.2 | 55.6 | 68.9 | 78.8 |
| 1988 | 14.8 | 29.3 | 42.1 | 52.9 | 65.2 | 75.6 | 79.7 |
| 1992 | 14.0 | 27.5 | 38.4 | 47.0 | 56.3 | 68.2 | 77.4 |
| 1996 | 14.3 | 28.9 | 41.3 | 50.6 | 60.0 | 70.9 | 79.3 |
| 1999 | 14.2 | 28.9 | 41.7 | 51.8 | 60.9 | 71.4 | 78.7 |
| 2001 | 11.1 | 21.1 | 34.7 | 43.21 | 51.2 | 58.2 | 62.3 |
| 2003 | 10.2 | 24.0 | 36.0 | 45.0 | 54.0 | 63.5 | 68.9 |
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