user
Instruction
Answer the question based on the provided table.


Table
Table Title: 'List of Speakers' regarding 'List of Speakers of the Norfolk Legislative Assembly'
Table Content:
| Name | Entered office | Left office |
| --- | --- | --- |
| Hon. David Ernest Buffett | ? | ? |
| Hon. John Terence Brown | 21 May 1986 | 22 May 1989 |
| Hon. David Ernest Buffett | 22 May 1989 | 20 May 1992 |
| Hon. John Terence Brown | 20 May 1992 | 4 May 1994 |
| Hon. David Ernest Buffett | 4 May 1994 | 1997 |
| Hon. George Charles Smith | 5 May 1997 | 2000 |
| Hon. David Ernest Buffett | 28 February 2000 | 2006 |
| Hon. Geoffrey Robert Gardner | 1 February 2006 | 27 March 2007 |
| Hon. Lisle Denis Snell | 28 March 2007 | 24 March 2010 |
| Hon. Robin-Eleanor Adams | 24 March 2010 | 20 March 2013 |
| Hon. David Ernest Buffett | 20 March 2013 | 17 June 2015 |


Question
When was David Ernest Buffett speaker of the Assembly?


Answer Format
The final answer should be a sentence and use the following format:
```json
{
    "answer": "your_generated_sentence_here"
}
```
rule
["Buffet was elected as Speaker of the Norfolk Legislative Assembly on 20 March 2013 and had previously served as Speaker from 1994–1997 and 2000–2006."]