Decade | Amount of Cities | Population | Coverage | Density |
1940 | 412 | 128051 | 19.2 | 6742 |
1950 | 481 | 128811 | 19.5 | 6536 |
1960 | 673 | 112400 | 22.8 | 5340 |
1970 | 835 | 104785 | 28.5 | 4673 |
1980 | 944 | 97756 | 32.8 | 3998 |
1990 | 1063 | 98108 | 34.9 | 3783 |