WASHINGTON — The U.S. Bureau of Transportation Statistics (BTS) reported that surface transportation between the U.S., Canada and Mexico was 6.6 percent higher in June than the same month last year, for a total of US $82.6 billion.

Adjusted for inflation and exchange rates, June’s total was $61 billion in 2004 dollars, up 11 percent from June 2011.

Value decreased 1.4 percent from May, BTS reported, noting that month-to-month changes can be affected by seasonal variations.

In June, 87.7 percent of U.S. trade by value with Canada and Mexico moved via land, 8.3 percent moved by vessel, and 4 percent moved by air.

Trade by surface transportation between the U.S. and Mexico has increased at a faster pace than trade with Canada, BTS said. U.S.-Canada trade reached $48.4 billion, a 5 percent increase, and U.S.-Mexico trade reached $34.2 billion, an 8.8 percent increase.

The state of Michigan was Canada’s biggest surface trade partner, coming in at $6.5 billion, a 4.5 percent increase from June 2011. Of the top 10 states by value, California led with the largest percentage increase over June 2011, at 55.1 percent. Vehicles were the largest commodity traded between California and Canada, and increased 171.6 percent from June 2011 to $1.66 billion.

The top commodity category transported between the U.S. and Canada by surface modes of transportation in June was vehicles, valued at $9.9 billion.