| Characteristic | First half 2018 | First half 2019 |
|---|---|---|
| - | - | - |
| - | - | - |
| - | - | - |
| - | - | - |
| - | - | - |
| - | - | - |
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Sources
Release date
October 2019
Region
Worldwide
Survey time period
first half of 2018 and 2019
Supplementary notes
Sales were made at Sotheby's, Christie's and Phillips auction houses.
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