First pedestrian promenade in 1962: 15,800 m².

By 1973, the network of pedestrian streets connected the most important locations in the city centre: 49,200 m².

The network of car-free streets and squares in 2005: 99,770 m².

The graph shows the development of pedestrian areas in the parts of the inner city where studies have been conducted from 1962-2005. The numbers indicate m².