Blyleven's shutouts

http://www.baseball-reference.com/play-index/

Spanning Multiple Seasons or entire Careers, From 1942 to 2010, (requiring SHO>=50), sorted by greatest Shutout

https://spreadsheets.google.com/pub?key=0Ai3KONa1HbjDdDZwUF9RQ0JCcndDZThvWGtla21xUEE&hl=en&output=html

Shutouts as a percent of starts:

Rk Player SHO/GS SHO GS
6 Bob Gibson 11.62% 56 482
10 Juan Marichal 11.38% 52 457
8 Jim Palmer 10.17% 53 521
1 Warren Spahn 9.47% 63 665
3 Tom Seaver 9.43% 61 647
4 Bert Blyleven 8.76% 60 685
2 Nolan Ryan 7.89% 61 773
7 Steve Carlton 7.76% 55 709
9 Gaylord Perry 7.68% 53 690
5 Don Sutton 7.67% 58 756

Gibson, Marichal and Palmer pitched shutouts in at least ten percent of their starts. Amazing.