| Year | Groundwater | Surface water |
|---|---|---|
| 1990 | 1039 | 2819 |
| 1995 | 476 | 1524 |
| 2000 | 399 | 1611 |
| 2001 | 437 | 1615 |
| 2002 | 547 | 1004 |
| 2003 | 537 | 723 |
| 2004 | 520 | 807 |
| 2005 | 522 | 1001 |
| 2006 | 435 | 1249 |
| 2007 | 422 | 1278 |
| 2008 | 428 | 1395 |
| 2009 | 447 | 1406 |
| 2010 | 430 | 1520 |
| 2011 | 381 | 1923 |
| 2012 | 368 | 2044 |
| 2013 | 403 | 1714 |
| 2014 | 400 | 1670 |
| 2015 | 499 | 1364 |