I tried to dig up an older thread about this and post there, couldn't find it. Simply, a bronzium drop rate, sample size 800 drops.
-Gear: 598/800, of which only 2 were purple: mk8 blastech weapon mod prototype, and a mk4 stun gun
-Credits: 61/800 drops
-Training droids: 56/800 drops
-Shards: 71/800 drops; of this, 8 of those shards were toons I didn't have unlocked (not sure if that means anything)
-Characters: 14/800, of which I already had 13. Unlocked Gen. Veers; Poggle, Snowtrooper, Teebo, Ewok Elder x2, IG-86, Biggs Darklighter x2, Royal Guard x2, Ashoka Tano, Ewok Scout, and Jedi Consular. This ends up being 132 shards converted at the shard shop.
Although I have no use for over half the drops, newer players certainly could use these items. I noticed when I started getting shards, at least 2 more dropped close after, sometimes a character, then a long run of gear. Hope this is of benefit to some. Have fun!