[marktwain]

6 documented cases from 1890 to 1960 were found.

5 found 1960 to 1969.

5 found 1970 to 1979.

5 found 1980 to 1989.

8 found 1990 to 1999.

30 found 2000 to 2009.

55 found 2010 to 2019.

[Does so]

That rate comports to the increased use (and documentations) of the Internet and computers in general.