Be careful about using statistics like this. The current period is not as much time as the others.
Well there were two this year, bringing this half-decade to 5 so far, so if no more majors hit this year, we're on pace for 10 this decade; that would match the highest decade, 1940-1950, but not exceed it.
It's a point, to be sure. But, look at the decades 1891-1900 and 1941-1950. Even assuming the current rate for the remainder of this decade, i.e., doubling the 2001-2004 figures, the sum falls short of many of the other decades.