Source: Nielsen [download page]
Notes: Drama ($12 billion in ad spend) netted the biggest share of the $78 billion TV ad spending pie last year, at more than 15%. General news ($9 billion) was next, followed by sitcoms ($6 billion). Separately, Nielsen indicates that dramas account for 37% of primetime programming (for the 2013-2014 season-to-date) but an outsized 62% share of timeshifted viewing. By contrast, Americans prefer to watch their sports live: sports programming has accounted for 31% share of primetime programming this season, but just 7% share of timeshifted viewing.