سؤال قراءة ستيب محلول — الاستنتاج (تدريب 8103)

Bar chart of freshwater levels by country across six years (1967, 1977, 1987, 1997, 2007, 2011) for Algeria, Egypt Arab Rep., Morocco, 'Asoudi Arabia' [printed typo for Saudi Arabia], Syrian Arab Republic, and Tunisia. Approximate values: Algeria: 1967 ~800, 1977 ~600, 1987 ~470, 1997 ~370, 2007 ~270, 2011 ~250 Egypt, Arab Rep.: all years very low, roughly 20-40 throughout Morocco: 1967 ~2000, 1977 ~1600, 1987 ~1200, 1997 ~1000, 2007 ~900, 2011 ~850 Asoudi Arabia [Saudi Arabia]: 1967 ~480, 1977 ~280, 1987 ~200, 1997 ~150, 2007 ~110, 2011 ~100 Syrian Arab Republic: 1967 ~1200, 1977 ~850, 1987 ~600, 1997 ~450, 2007 ~380, 2011 ~320 Tunisia: 1967 ~830, 1977 ~680, 1987 ~530, 1997 ~480, 2007 ~450, 2011 ~430 (the rendered chart's y-axis shows only bare numbers 0-2500 with no visible unit label; the question below refers to the units as 'cubic meters')