Five NATO members are expected to meet the alliance’s 2 percent target for defense spending in 2015, according to data released on Monday.

Poland joins Britain, Estonia, Greece, and the United States as the only members of the 28-country alliance to meet the threshold.

NATO Secretary General Jens Stoltenberg commended the change, but warned that total alliance spending will decline by roughly 1.5 percent this year.

Of the 28 countries, 18 are increasing their military spending in real terms, the data indicates. Still, alliance members will spend a collective total $892 billion on defense in 2015, down from $942 billion in 2014 and $968 billion in 2013.