From some poking around I did for work: Animation Feature Market 2009

All data from public sources as cited.

Digital Animation Feature Film U.S. Box Office Revenue (and Market Share) by Year
http://www.the-numbers.com/market/ProductionMethods/DigitalAnimation.php

Note that 2009 is incomplete.

• 2005 $553M
  
• 2006 $1,082M
  
• 2007 $1,179M
  
• 2008 $1,032M
  
• 2009 $463M
  

If I try to make an estimate for 2009 overall, it looks like it's going to be about the same as last year:

• Monster vs. Aliens $195M (actual)
  
• Coraline $75M (actual)
  
• Up $300M (actual $263M to date)
  
• Bolt (released in 2008) $4M (actual)
  
• The Battle for Terra $1M (actual)
  
• The Tale of Despereaux $7M (actual)
  
• Ice Age 3 $170M (actual $68M in first weekend)
  
• Ponyo $10M
  
• Sita Sings the Blues $2M
  
• Cloudy with a Chance of Meatballs $100M
  
• 9 $20M
  
• Fantastic Mr. Fox $30M
  
• Astro Boy $60M
  
• Planet 51 $35M
  
• The Princess and the Frog $100M
  
• Total $1109M
  

Traditional animation is excluded from the above but is trivially small. Admittedley, Coraline's category is open to interpretation.

There's really nothing there that would allow one to analyze the effect of 3D screens across the whole market, but for individual films it appears to generate the majority of their revenue. Here are some quotes from www.boxofficemojo.com about some particular films and weekends:

Coraline conjured $18.9 million over the four-day weekend... Coraline's 3D gross was down only seven percent, accounting for an estimated $14 million of the four-day weekend at 1,060 sites. The tally stands at $39.1 million in eleven days, around 72 percent of which coming from 3D presentations. [February 17]

Ice Age: Dawn of the Dinosaurs gathered $67.5 million in five days (55 percent of which from 1,606 3D venues). [July 5]

... with the release of Up. The adventure comedy swooped in with a $68.1 million start... the [3D] format accounted for $35.4 million of Up's gross. [June 1]

Animated Features Released to Theatres in the United States

by Jerry Beck (well-known animation historian)

• 2005 11 films
  
• 2006 21 films
  
• 2007 13 films
  
• 2008 20 films
  
• 2009 13 films known at this point (includes anticipated releases for remainder of year)

from http://www.cartoonresearch.com/movies2005.html.