This winter, I wrote a long piece about Philip Humber and perfect games for ESPN the Magazine. A lot of the piece was about the increase in perfect games in Major League Baseball. But is this trend specific to Major League Baseball or does it apply to baseball in general? As it turns out, perfect games have gone in the opposite direction in Japan.

1950s: 5
1960s: 5
1970s: 4
1980s: 0
1990s: 1
2000s: 1 

Furthermore, the one thrown in the 2000s was a joint perfect game, thrown in the Japan Series in 2007. I asked Patrick Newman of NPB Tracker if there's any reason for this trend.

It's easier to postulate an explanation for the relatively higher number of perfect games in the 1950's. It was a dead ball period, and there were more teams in the league, so the talent pool was spread a little more thinly. The quality of play in Japan was worse back then. NPB was a league that Leo Kiely could dominate on the mound and at the plate back then. I think this made the outliers stand out more. 

No-hitters are also less common in Japan. There were three in 2012, but those were the first since 2006. It seems like we see at least one most years in MLB.

Patrick pointed to a near perfect game in May 2012. "Toshiya Sugiuchi came agonizingly close to one in 2012, but he walked the 27th batter he faced, on a two-strike count. He still got a no-hitter though."

Sugiuchi's feat/non-feat was portrayed in the Japanese press as an act of selflessness:

Yomiuri Giants hurler Toshiya Sugiuchi is the kind of guy who doesn’t readily toss a potential gopher ball over the middle of the plate, even if a perfect game is at stake.

For him, there’s something more important a pitcher should look for instead of chasing an individual accomplishment.
So when he made the count 3-2 against Tohoku Rakuten pinch hitter Toshiya Nakashima with two outs in the ninth at Tokyo Dome on Wednesday, he didn’t lose sight of his priority — a win.

“When I got 3-2 in the count, the first thing I thought was to not allow a hit, so I thought it was fine if it ended up a walk,” Sugiuchi said after tossing a no-hitter in Yomiuri’s 2-0 win over the Golden Eagles. “And it did end up (being) a walk.” 

Interestingly, Philip Humber threw a slider on 3-2 with two outs in the ninth of his perfect game, and said that part of his decision was based on the idea that, if he laid one in, he'd lose the perfect game and the no-hitter. If he walked the batter, he'd still have a no-hitter, and know that he tried to throw his best pitch. 

Sugiuchi finished the season 12-4 with a 2.04 ERA and, for the fifth year in a row, more than a strikeout per inning. His nickname is Mr. May.

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"he'd still have a perfect game" should read "no hitter" in the third to last sentence. I want to know more about Leo Kiely dominating from both sides of the plate in his one year in Japan.
Sugiuchi's explanation doesn't even make sense on a baseball-cliche level... if the Giants
Ooops - Sugiuchi's explanation doesn't even make sense on a baseball-cliche level... for the Giants to give up the lead, Nakashima would have to end up scoring anyway, so it makes no difference if he's on first after a walk, or third after a triple, or in the dugout after a home run.
If you re-read the quote, Sugiuchi doesn't say anything about getting a "win" but rather that's something article implied. Sugiuchi's quote says to me his thinking was more in line with Humber's.
*the article