Although the tilt was already noted in 1640, the lean increased rapidly during the 20th century. In 1920 the overhang was 2.21 m, in 1960 it was 3.60 m, in 2001 it was 3,89 m and by 2013 it reached the present 4.60 m. The critical tipping point is considered to be 6.07 m.
Photo: Hobbyelektroniker / Wikimedia Commons
https://commons.wikimedia.org/wiki/File:Bad_Frankenhausen_Oberkirche_2010.jpg