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:
| Country | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| Australia | 160 | 230 | 290 | 230 | 200 | 200 | 200 | ? | ? | ? | ? | ? |
| Brazil | 30,000 | 22,000 | 26,000 | 29,000 | 29,900 | 35,000 | 40,000 | 57,300 | 58,000 | 58,000 | 58,000 | 58,000 |
| Canada | 2,290 | 3,200 | 3,410 | 3,280 | 3,400 | 3,310 | 4,167 | 3,020 | 4,380 | 4,330 | 4,420 | 4,400 |
| Congo D.R. | ? | 50 | 50 | 13 | 52 | 25 | ? | ? | ? | ? | ? | ? |
| Mozambique | ? | ? | 5 | 34 | 130 | 34 | 29 | ? | ? | ? | ? | ? |
| Nigeria | 35 | 30 | 30 | 190 | 170 | 40 | 35 | ? | ? | ? | ? | ? |
| Rwanda | 28 | 120 | 76 | 22 | 63 | 63 | 80 | ? | ? | ? | ? | ? |
| World | 32,600 | 25,600 | 29,900 | 32,800 | 34,000 | 38,700 | 44,500 | 60,400 | 62,900 | 62,900 | 62,900 | 63,000 |
Question:
according to usgs estimates of mine production, what was the total estimated mine production of niobium minerals from the nation of brazil in 2006?
Answer:
40,000