Since 1918, the tower has been measured every year. In the 40 years from 1918 to 1958, it tilted by an average of 1.1 mm per year. In the 10 years from 1959 to 1969, the annual tilt averaged 1.26 mm. The top center now tilts 4.5 meters to the south off the center vertical line.
the meaning of the above words?
The Leaning Tower of Pisa is leaning faster