Here's the data from the Pro Football Reference website.
Total Drops:
Bills 28
Rank 2 (behind Green Bay with 30)
Drop Percentage:
Bills 6.4%
Rank 6 (behind Baltimore, Green Bay, San Francisco, NY Giants and Tennessee)
NFL Avg 5.2%
Total Targets:
Bills 437
Rank 6 (behind Tampa Bay, LA Chargers, Kansas City, Cincinnati and NY Jets)
Total Completions:
Bills 288
Rank 10 (behind Tampa Bay, LA Chargers, Kansas City, Cincinnati, Seattle, Indianapolis, Jacksonville, Minnesota and Arizona)
Average Yards Per Attempt:
Bills 7.92
Rank 7 (behind Miami, Kansas City, Philadelphia, Seattle, Chicago and Cincinnati)
NFL Avg. 7.43
Average Yards Per Completion:
Bills 12.01
Rank 6 (behind Miami, Kansas City, Chicago, San Francisco and Atlanta)
NFL Avg. 11.03