North Korean imports of solar panels from neighboring China fell to their lowest levels in six years in 2017, Chinese trade figures show, even as the international community looked to restrict the DPRK’s more traditional energy sources.

The DPRK’s interest in buying solar panels from China peaked in 2015 when North Korea spent over $8 million to import 682,950 panels, according to China’s General Administration of Customs.

But the number has since fallen to just under $2 million last year when the DPRK imported 138,685 panels, the lowest figure since 2012.

The most recent January figures provided