One of the frequent criticisms of Dawson was his alleged penchant for throwing too many deep balls. FWIW, actual stats do not suggest that was the case. Short of actually tracking every pass thrown in every game the best statistical indicators are Yards/Attempt and Long Balls Completed/Game. YPA is usually regarded as the best indicator of the "length" of your passing game. Year in and year out the national average hovers just over the 7.0 mark. For 2015:
6.3 YPA: #103 nationally and a full yard under the 2015 national average (7.3)
10 yard+ completions/game: 8.3 #77 nationally
20 yard+ completions/game: 3.2 #61 nationally
Peace