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KANSAS CITY, Mo. (AP) — Missouri is the first state in more than five years to have a statewide average gas price of below $2 a gallon, and Oklahoma is expected to get there by the weekend.

AAA spokesman Michael Green says the national average price of gas is $2.32 per gallon, the lowest since May 2009. Missouri’s average fell below $2 per gallon Friday morning and stood at $1.98 midday.

Green says Oklahoma’s average Friday morning was $2.01, while Kansas had the third-lowest average at $2.06.

Green called the steady decline in gas prices unlike anything AAA has previously tracked. He says the national average has dropped for 92 days in a row — the longest streak on record.

He says gas prices could go down another 5 to 10 cents by year’s end.