Riven statistics for Sortie and Archon's Hunt rewards

921 rewards.

Official droptables on Warframe.com

Reward type	Count	Percentage
Anasa Ayatan Sculpture	253	27.5%
Riven Mod	264	28.7%
Endo	101	11.0%
Kuva	105	11.4%
Booster	104	11.3%
Exilus Warframe Adapter	25	2.7%
Forma	25	2.7%
Orokin Catalyst blueprint	23	2.5%
Orokin Reactor blueprint	19	2.1%
Legendary Core	2	0.2%

Statistics for Netracell mission rewards

149 rewards.

Official droptables on Warframe.com

Reward type	Count	Percentage
Crimson Archon Shard	29	19.5%
Melee Crescendo	9	6.0%
Amber Archon Shard	32	21.5%
Melee Duplicate	14	9.4%
Azure Archon Shard	33	22.1%
Melee Arcane Adapter	32	21.5%