Sales numbers for cameras and lenses tend to be freely available in Japan, which is something lacking in the rest of the world, especially Europe and North America.
BCNRetail has released its market share numbers for the 12 months between April 2018 through to March 2019.
Manufacturer market share leaderboard:
Canon maintains a big lead in market share for cameras.
Year-over-year sales growth/decline leaderboard:
Fujifilm was the big winner year-over-year, and Canon saw a slight decline in sales. Nikon had the biggest falloff.
You can check out the full report over at BCNRetail.