| Period | Letters to Investors |
|---|---|
| September 2020 |
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| June 2020 |
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| March 2020 |
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| December 2019 |
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| July - September 2019 |
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| June 2019 |
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| March 2019 | Download |
| December 2018 | Download |
| September 2018 | Download |
| June 2018 | Download |
| March 2018 | Download |
| December 2017 | Download |
| September 2017 | Download |