A line graph showing sales data from 1836 to 1853. The x axis represents the years from 1836 to 1853, and the y axis represents the sales in Castilian quintals, ranging from 0 to 35,000. The graph shows fluctuations in sales over the years, with notable peaks around 1836, 1849, and 1850. All values are approximated.
Evolution of sales, grouped by month, 1836–1853 (Castilian quintals). Source: Own elaboration