[JJ] Mulhall’s estimate, except 1830, 1890, 1900, 1906, and 1907.
[KK] Steam tonnage reduced to sail by multiplying by 4.
[LL] Soetbeer’s estimates prior to 1860.
[MM] Malte-Brun’s estimate for 1804.
[NN] Based on Balbi’s estimate for 1828.
[OO] Based on Michelet’s estimate for 1845.
[PP] Based on Behm-Wagner estimate for 1874.
[QQ] Levasseur’s estimate for 1878.