Otherwise , there is no evidence that no-hitters are more common now than in the past .
The rate for the 1990 - 1993 period is unusually high ; however , this is only because so many occurred in 1990 and 1991 .
There is no evidence that no-hitters are more common now than in the past .
The rate for the 1990 - 1993 period is unusually high ; however , this is only because so many occurred in 1990 and 1991 .