	1984	1988	1994	1997	1999	2002	2007	2011
Total area (ha)	116	139	257	290	326	394	402	413
Total aggregate removed (m³ × 10⁶)	13.9	16.3	30.9	35.4	40.0	48.3	49.2	50.2
Total water stored (m³ × 10⁶)	0.39	0.45	0.85	0.98	1.10	1.33	1.35	1.38