| Year | Fresh groundwater (million m3) | Fresh surface water (million m3) |
|---|---|---|
| 1990 | 1673 | 1210 |
| 1995 | 1008 | 1104 |
| 2000 | 1081.662 | 800.751 |
| 2001 | 1085.718 | 799.755 |
| 2002 | 1080.639 | 786.357 |
| 2003 | 1068.781 | 766.128 |
| 2004 | 1038.309 | 752.6307 |
| 2005 | 1033.773 | 739.3859 |
| 2006 | 1009.888 | 720.2644 |
| 2007 | 960.5918 | 737.5045 |
| 2008 | 919.3519 | 718.5048 |
| 2009 | 857.7985 | 714.6986 |
| 2010 | 877.3167 | 720.8199 |
| 2011 | 891.2096 | 746.9264 |
| 2012 | 898.2953 | 743.3357 |
| 2013 | 874.2959 | 696.3268 |
| 2014 | 866.5499 | 704.1122 |
| 2015 | 844.5869 | 602.9206 |
| 2016 | 818.5 | 632.3 |
| 2017 | 811.5 | 586.2 |