Sources used for stats (not exclusive)
Broadbury and Klein – Aggregate And Per Capita GDP In Europe, 1870-2000 (2011)
Broadbury and Harrison – the Economics of World War One (2005)
World Trade Report 2007
Goetzmann & Ukhov – British Investment Overseas 1870–1913 (2005)
Ballou – Comparisons of Naval Strength (1916)
Niall Fergusson – The Pity of War (1998)
Purnell – History of the Twentieth Century (1965)
Edwyn E Gray – The U-Boat War 1914 – 1918 (1972)
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