In Indonesian education, it is often emphasized that the Dutch took advantage of "divide and conquer" tactics (and superior technology) to keep ruling Indonesia (then the Dutch East Indies) despite being very outnumbered. At its peak, how many Dutch people lived in Indonesia during the colonial period? And how outnumbered was this compared to the native population?
This Wikipedia article shows the results of the 1930 Dutch East Indies census (in the Social History section), listing 240,417 Europeans out of a total population of over 60.7MM.
Calculating this as 0.4% European (with an additional 2.2%, or 1.35MM, Chinese and other foreign orientals), the European population was outnumbered 250-1 and the non-indigenous population was out-numbered 39-1.
While the absolute numbers would have increased between 1930 and 1941, it seems unlikely that any substantial change in ratio occurred in that 11 years, as there was no event to precipitate such a change until the Japanese invasion.