Although a language census is no longer possible in Belgium, we can still find out the proportion of French and Dutch speakers in the capital, albeit using indirect methods such as parliamentary questions. According to administrative information from regional tax office and the National Pension office, Brussels is 90% French-speaking, Le Soir revealed on Monday.
When we look at the number of pension requests in French and Dutch in Brussels, we see that in 2010 only 8.65% of them were done in Dutch, compared to 7.43% in 2012. More than 90% of the requests were from French-speakers.
For regional tax, 93.1% of households spoke French in 2013, and 93.29% in 2014.