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:
| Name | Birth | Marriage | Became Duchess | Ceased to be Duchess | Death | Spouse |
| --- | --- | --- | --- | --- | --- | --- |
| Eleanor Gonzaga | 18 November 1630 | 30 April 1651 | 9 July 1654 husband's accession | 2 April 1657 husband's death | 6 December 1686 | Ferdinand I |
| Margarita Teresa of Spain | 12 July 1651 | 12 December 1666 | 12 December 1666 | 12 March 1673 | 12 March 1673 | Leopold I |
| Claudia Felicitas of Austria | 30 May 1653 | 15 October 1673 | 15 October 1673 | 8 April 1676 | 8 April 1676 | Leopold I |
| Eleonor Magdalene of the Palatinate-Neuburg | 6 January 1655 | 14 December 1676 | 14 December 1676 | 5 May 1705 husband's death | 19 January 1720 | Leopold I |
| Wilhelmina Amalia of Brunswick | 21 April 1673 | 24 February 1699 | 5 May 1705 husband's ascension | 17 April 1711 husband's death | 10 April 1742 | Joseph I |
| Elisabeth Christine of Brunswick-Wolfenbüttel | 28 August 1691 | 1 August 1708 | 17 April 1711 husband's ascension | 1722 Passed to Lorraine | 21 December 1750 | Charles I |
Question:
When did eleonor magdalene of the palatinate-neuburg become duchess?
Answer:
14 December 1676