Sept 7 (Reuters) - Saudi Arabia's imports plunged an annual 17.0 percent in July, the ninth drop in a row, while growth in **n-oil exports slowed to 12.4 percent, data from the Central Department of Statistics and Information showed on Sunday. SAUDI FOREIGN TRADE 07/14 06/14 07/13 (in bln riyals) **n-oil exports 18.321 18.676 16.307 imports 46.621 51.457 56.160 DYNAMICS OF TRADE (pct y/y change in riyal terms) **minal **n-oil exports 12.4 14.9 5.8 **minal imports -17.0 -8.2 3.3 **TE. **n-oil exports account for around 12 percent of overall exports of Saudi Arabia. ...