According to the newly released 2017 National Household Travel Survey (NHTS) by the Federal Highway Administration (FHWA), the average light vehicle occupancy in 2017 was 1.67—unchanged from 2009.
By vehicle type, cars and pickups remained nearly the same, while vans and motorcycles had higher occupancy in 2017 than in 2009. The occupancy rate for vans has increased from 2.07 in 1995 to 2.44 in 2017. Vans were the only category with an occupancy rate higher than two.
The only category that had a lower occupancy rate in 2017 was sport utility vehicles.
There's a bar graph.