Would be interesting to see similar breakdown for Canada. The US numbers are trending upward but still below the max in 2004. See full article (with charts!) here:
- An increase of 40.9% from 1984 to 2004 (from 6,612 miles to 9,314 miles).
- A decrease of 9.0% from 2004 to 2013 (from 9,314 miles to 8,472 miles).
- An increase of 4.5% from 2013 to 2018 (from 8,472 miles to 8,855 miles).