Long description

This is a line graph with percentages from zero to forty on the vertical axis, and dates in five-year intervals from 1839 to 1899 on the horizontal axis. A blue line representing the marks of grooms descends steadily from 33% to less than 5% in 1899. An orange line representing prisoners descends less smoothly from 37% in 1839 to 16% in 1899 – with the sharpest decline in the 1880s and 1890s.