Oxbow won last year’s Preakness with a below-average Beyer Speed Figure of 106. (Jonathan Newton/The Washington Post)

Beyer Speed Figures measure how fast a horse has run in each of his races. The rating is incorporated into every thoroughbred’s record in the Daily Racing Form.

The average winning figure for the Preakness is 109. California Chrome and Social Inclusion are the only entrants in this year’s field who have run close to that norm. California Chrome earned figures of 108 and 107 winning two important stakes in California, but his 97 in the Derby was the lowest winning figure in the race since these figures have been published. Social Inclusion ran a smashing figure of 110 in an allowance race at Gulfstream Park, but he was subsequently beaten in the Wood Memorial Stakes at Aqueduct, where he earned a 98.

Winning Preakness figures since 1991:

2013: Oxbow, 106

2012: I’ll Have Another, 109

2011: Shackleford, 103

2010: Lookin at Lucky, 102

2009: Rachel Alexandra, 108

2008: Big Brown, 100

2007: Curlin, 111

2006: Bernardini, 113

2005: Afleet Alex, 112

2004: Smarty Jones, 118

2003: Funny Cide, 114

2002: War Emblem, 109

2001: Point Given, 111

2000: Red Bullet, 109

1999: Charismatic, 107

1998: Real Quiet, 111

1997: Silver Charm, 118

1996: Louis Quatorze, 112

1995: Timber Country, 106

1994: Tabasco Cat, 112

1993: Prairie Bayou, 98

1992: Pine Bluff, 104

1991: Hansel, 116

— Andrew Beyer