GDUSA Reader Survey Reveals Strong Support for President Obama, a Belief That Old Age Begins as Early as Age 45 and Continued Growth in the Use of Stock Imagery Among Designers
You can read the full article at http://microstockinfos.blogspot.com/2011/08/gdusa-reader-survey-reveals-strong.html

iStockphoto is the favorite/go-to microstock agency

    50% of designers who have a preference use iStock


Designers use a mix of rights managed and royalty free images

    Rights managed – 32%
    Royalty free – 93%


Designers spend more total dollars on royalty free images

    Rights managed – 6%
    Royalty free – 81%
    About the same – 13%


Designers use multiple stock sites

    Use only one – 11%
    Use 2-3 – 47%
    Use 4-9 – 31%
    Use 10 or more – 11%


Top 5 categories of images used most often

    People
    Business/industry
    Lifestyle
    Abstracts/backgrounds/concepts
    Food and Beverage


Publications doing the best job at extending print design to online platforms

    Wired
    Martha Stewart
    New York Times
    Oprah
    National Geographic


Believe ageism begins to manifest itself in the design agency business

    At age 55 and up – 26%
    At age 50 – 34%
    At age 45 – 30%

Quote

iStockphoto is the favorite/go-to microstock agency
Designers use a mix of rights managed and royalty free images
    Rights managed – 32%
    Royalty free – 93%

32% + 93% > 100%

(It may mean that some use both, but others surveys in the same page are totalling 100%)

I took it for granted that it meant that some use both ("designers use a mix")