From the Boing Boing Flickr pool, Maia Weinstock's chart of gender in Lego minifig heads. There's an accompanying blog post, where Weinstock explains:

So many of LEGO’s sets today are made in conjunction with a movie or other Hollywood media brand. It’s a win-win for Hollywood producers and LEGO alike. But how many of those brands star girls or women in the lead role? Star Wars? Toy Story? Pirates of the Caribbean? The Lord of the Rings (available in LEGO this summer)? Hermione Grainger is a major character from the Harry Potter series, and there were a fair number of female minifigs incorporated with those sets, so I’ll give them that one. But still, in almost every franchise that LEGO has partnered with, females are secondary or sidekick characters at best. To be sure, this heavy male slant in children’s programming is a problem with Hollywood as a whole, not just with the famed brick-makers. (For an in-depth look at how girls and women are marginalized, sexualized, and stereotyped in family films, check out these studies by the Geena Davis Institute on Gender in Media.) And yet, LEGO could go a long way toward increasing its girl-friendly cred by creating sets and minifigs that mirror movies and shows featuring prominent leading ladies—like Avatar, Dora the Explorer, Spy Kids, and The Hunger Games.

See also: History of gendering in Lego.

LEGO minifig head breakdown by pixbymaia