| Characteristic | 2012 | 2013 | 2014 | 2015 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 |
|---|---|---|---|---|---|---|---|---|---|---|
| - | - | - | - | - | - | - | - | - | - | - |
| - | - | - | - | - | - | - | - | - | - | - |
| - | - | - | - | - | - | - | - | - | - | - |
| - | - | - | - | - | - | - | - | - | - | - |
| - | - | - | - | - | - | - | - | - | - | - |
| - | - | - | - | - | - | - | - | - | - | - |
| - | - | - | - | - | - | - | - | - | - | - |
| - | - | - | - | - | - | - | - | - | - | - |
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Sources
Release date
February 2023
Region
United States
Survey time period
2012 to 2021
Special properties
2022: among 1,372 publishers that reported their results to the source
Supplementary notes
Figures for the years prior to 2021 and 2022 come from previous reports. Data for K-12 instructional materials was not provided for either of these years.
Data for 2016 not available.
For the years 2017 and 2018, data for the 'other' category was not provided.
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