Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| No. | Title (Latin) | Title (English translation) | Subject | Date |
| --- | --- | --- | --- | --- |
| 1. | Qui Pluribus |  | On Faith and Religion | 9 November 1846 |
| 2. | Praedecessores Nostros |  | On Aid for Ireland | 25 March 1847 |
| 3. | Ubi Primum |  | On Discipline for Religious | 17 June 1847 |
| 4. | Ubi Primum |  | On Immaculate Conception | 2 February 1849 |
| 5. | Nostis Et Nobiscum |  | On the Church in the Papal States | 8 December 1849 |
| 6. | Exultavit Cor Nostrum |  | On the Effects of the Jubilee | 21 November 1851 |
| 7. | Nemo Certe Ignorat |  | On Discipline for Clergy | 25 March 1852 |
| 8. | Probe Noscitis Venerabiles |  | On the Discipline for Clergy | 17 May 1852 |
| 9. | Inter Multiplices |  | Pleading for Unity of Spirit | 21 March 1853 |
| 10. | Neminem Vestrum |  | On the Persecution of Armenians | 2 February 1854 |
| 11. | Optime Noscitis |  | On the Proposed Catholic University of Ireland | 20 March 1854 |
| 12. | Apostolicae Nostrae Caritatis |  | Urging Prayers of Peace | 1 August 1854 |
| 13. | Optime Noscitis |  | On Episcopal Meetings | 5 November 1855 |
| 14. | Singulari Quidem |  | On the Church in Austria | 17 March 1856 |
| 15. | Cum Nuper |  | On Care for Clerics | 20 January 1858 |
| 16. | Amantissimi Redemptoris |  | On Priests and the Care of Souls | 3 May 1858 |
| 17. | Cum Sancta Mater Ecclesia |  | Pleading for Public Prayer | 27 April 1859 |
| 18. | Qui Nuper |  | On the Pontifical States | 18 June 1859 |
| 19. | Nullis Certe Verbis |  | On the Need for Civil Sovereignty | 19 January 1860 |
| 20. | Amantissimus |  | On the Care of the Churches | 8 April 1862 |
| 21. | Quanto Conficiamur Moerore |  | On Promotion of False Doctrines | 10 August 1863 |
| 22. | Incredibili |  | On the Persecution in New Granada | 17 September 1863 |
| 23. | Maximae Quidem |  | On the Church in Bavaria | 18 August 1864 |
| 24. | Quanta Cura |  | Condemning Current Errors | 8 December 1864 |
| 25. | Meridionali Americae |  | On the Seminary for the Native Clergy | 30 September 1865 |
| 26. | Levate |  | On the Affiliations of Church | 27 October 1867 |
| 27. | Respicientes |  | Protesting the Taking of the Pontifical States | 1 November 1870 |
| 28. | Ubi Nos | "Our City" | On the Pontifical States | 15 May 1871 |
| 29. | Beneficia Dei |  | On the 25th Anniversary of His Pontificate | 4 June 1871 |
| 30. | Saepe Venerabiles Fratres |  | Thanksgiving for 25 Years of Pontificate | 5 August 1871 |
| 31. | Quae In Patriarchatu |  | On the Church in Chaldea | 16 November 1872 |
| 32. | Quartus Supra |  | On the Church in Armenia | January 1873 |
| 33. | Etsi Multa |  | On the Church in Italy, Germany and Switzerland | 21 November 1873 |
| 34. | Vix Dum A Nobis |  | On the Church in Austria | 7 March 1874 |
| 35. | Omnem Sollicitudinem |  | On the Greek-Ruthenian Rite | 13 May 1874 |
| 36. | Gravibus Ecclesiae |  | Proclaiming A Jubilee | 24 December 1874 |
| 37. | Quod Nunquam |  | On the Church in Prussia | 5 February 1875 |
| 38. | Graves Ac Diuturnae |  | On the Church in Switzerland | 23 March 1875 |
Question:
date of the last encyclical whose subject contained the word "pontificate"
Answer:
5 August 1871