this has been more than over-compensated for by a contraction in the number of wholly controlled sales outlets , although the overall volume output , corrected to 1966 figures and including a deseasonalisation factor , has slightly increased but this latter when adjusted to take account of inflation and the variability of international exchange rates remains more or less constant as at 1965 levels of profitability , but does not take into account a proportional drop in actual manufactured output due to excess overseas sales for the year . ''