I thought the numbers would be higher, since the pc engine was the second most popular console system in japan in the mid 90's...
By 1995, "the mid 90s", I'm not sure PCEs were even being produced. The FX came out in '94. I remember seeing ads featuring both the FX and Duo RX, but I'm not sure if they were actually still making RXs or if they were just trying to move the old stuff.
The SFC ruled Japan from the time of its launch until the Playstation took over. There really was no second place. The only time the PCE lead the pack was after everyone in Japan had a Famicom and the Super Famicom hadn't come out yet.
As for the underwhelming figures, don't forget that consoles and games in general now sell in much larger numbers than they did back then. Back then a medium budget game could sell 50,000 units and make the company a huge profit. Now people are selling 400,000 copies of something and then laying people off because they needed to sell a million to break even.