You are probably right - but the number of clubs in my city - Judo =2 Aikido = 6. Maybe Aikido is catching Judo up? [/b]
I'm sure aikidos recent percentile growth has been much larger, but only because you're building from a much smaller starting point.
I can't remember the figures I saw for Aikido practitioners worldwide, but I think at most it was 600,000-800,000 thousand, maybe a LOT less. Judos been an Olympic sport for a long while.