manpower and with corrections to values for transport based on British macroeconomic statistics. [4]. personal transport. Note. Data before mid-20th century are limited to England/Wales and Sweden. Fizaine and Court [31] show that in 1850-1950 total ECSgdp for the US was mostly in the range 7-15%. Sources: Csereklyei et al. [34]; Fouquet [15]; Kander [33]; Bashmakov and Grubb [5]; Bashmakov [4].