By 1890 the economy continued to industrialize and grow on an even higher rate than during the previous two decades and increased dramatically in the years leading up to World War I. Growth rates for the individual branches and sectors often varied considerably, and periodical figures provided by the "Kaiserliches Statistisches Amt" ("Imperial Statistical Bureau) are often disputed or just assessments. Classification and naming of internationally traded commodities and exported goods was still in progress and the structure of production and export had changed during four decades. Published documents provide numbers such as: The proportion of goods manufactured by the modern industry was approximately 25% in 1900, while the proportion of consumer related products in manufactured exports stood at 40%. Reasonably exact are the figures for the entire industrial production between 1870 and 1914, which increased about 500%.