Passage: In 1877 the price of British-grown wheat averaged 56 shillings and 9 pence a quarter and for the rest of the nineteenth century it never reached within 10 shillings of that figure. In 1878 the price fell to 46 shillings and 5 pence. In 1886 the wheat price decreased to 31 shillings a quarter. By 1885 wheat-growing land declined by a million acres (4,000 km²) (28½%) and the barley area had dwindled greatly also.  Britains dependence on imported grain during the 1830s was 2%; during the 1860s it was 24%; during the 1880s it was 45%, (for wheat alone during the 1880s it was 65%.) The 1881 Census in the United Kingdom showed a decline of 92,250 in agricultural labourers in the ten years since 1871, with an increase of 53,496 urban labourers. Many of these had previously been farm workers who migrated to the cities to find employment, despite agricultural labourers wages being higher than those of Europe. Agricultures contribution to the national income was about 17% in 1871; by 1911 it was less than 7%.
Did agriculture's contribution to the national income increase or decrease between 1871 and 1911? Did important grain dependence increase more between 1830 and 1860 or between 1860 and 1880? Did the price of wheat decrease more from 1877 to 1878 or from 1878 to 1886? How many more percent did dependence on imported grain increase from the 1860s to the 1880s than it did from the 1860s to the 1880s? How many percent did Britain's dependence on imported wheat increase from the 1830s to the 1860s? How many percent did agriculture's contribution to the national income change between 1871 and 1911? How many percent did important wheat dependence rise between the 1860s and 1880s? In the forty years after 1871, how many percent of the national income did agriculture's contribution drop? In the thirty years after the 1830s, how many percent did imported grain dependence rise? In which year was the price of wheat the lowest: 1877, 1878, or 1886? While agricultural labourers were declining in number, which group was increasing?