A nearly half-million dollar contribution from soft-drink giant Coca-Cola appears to have put Oregon's mandatory GMO-labeling measure over the top as the costliest ballot measure in state history.

Coca-Cola, while donating large sums of money in helping defeat similar labeling measures in California in 2012 and Washington in 2013, had sat out the fight over Measure 92.

Until, that is, it sprang for a $234,000 donation that was reported Oct. 13 on the Oregon secretary of state's financial filing website.

A second donation of $468,000, reported Thursday, brought the total donated to the No on 92 Coalition to $10.725 million.

In terms of all-time Oregon records, that is still short of the $12.1 million spent by opponents of 2007's Measure 50, which would have increased cigarette taxes to pay for children's health care.

However, when the $5.4 million raised by the Yes on 92 campaign is added to the "no" figure, that brings total spending on the labeling measure to $16.1 million, surpassing the $15.8 million combined spending by forces for and against Measure 50.

Readers can view our interactive map and searchable database here to see who has given how much to both sides.

The roughly two-to-one margin that proponents of Measure 92 are being outspent by mirrors the mandatory-labeling campaigns in California and Washington.

-- Dana Tims