Something I've been meaning to so for a while. I find it useful to be able to quickly identify what year an image was uploaded in order to evaluate earnings/year.

Below is a list of reference file numbers that represent the start of each year;

2014 - 170M
2013 - 125M
2012 - 91M
2011 - 68M
2010 - 43.6M
2009 - 22.5M
2008 - 8.1M
2007 - 2.3M
2006 - 840K
2005 - 84K

It's not absolutely exact but it is pretty close.

Interesting to note that in the early days the library was growing much faster as a percentage than it is today. In 2005 for example it grew 10x. During 2006 it grew another 4x and then almost another 3x in 2007. That's a growth of over 100x in 3 years. By contrast the library only grew 36% in 2013.

Interesting data, but one disagreement. Percentages don't match this kind of information. Whole numbers do.

Milestones:
September 21, 2006 - Shutterstock surpasses one million stock photos
Feb. 20th, 2009 -Shutterstock reaches 6 million photos,
February 14, 2010 - Shutterstock reaches 10 million Photos
June 19, 2012 - Shutterstock reaches 20m stock Images
October 30, 2013 - Shutterstock reaches 30 million images
Aug. 4, 2014 - Shutterstock celebrates 40 million images in it's collection.
Prediction at this rate:
April 2015 50 million images.
Dec. 2015 60 Million Images!

While your point is the percentage of new images has dropped, with larger numbers as the collection grows, percentage does address that in nine months: 2013-2014 Ten Million New Images got accepted!

It took 16 months for the ten million before that and 29 for the ten million before that, with something like six years for the first ten million.

When it hits 50 million, the percentage growth will be smaller, because it's a smaller part of a much larger number. But the ten million images, is still another ten million! 

We aren't competing on percentages, we are competing with whole numbers. What is a percentage, which is shrinking at a rapid rate is, our individual percentage of the total images.