Walnut & Almond tree dropping fruit

Could someone tell me why my walnut tree is loosing its good sized walnuts.  The tree is about 15 years old and I can see light vane lines on the leaves.  The leaves are medium green in color.  My almond tree also dropped its almonds earlier this year. It has done this for the second or third year in a row.  98 % of the almonds drop.
 
L. Schmiege.
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