Dropped to 0.02% circa 1878, stayed about there until a slow trend upwards started in 2012, now at 0.09% in 2014: http://chronicle.nytlabs.com/?keyword=while.wh

Dropped to 0.02% circa 1878, stayed about there until a slow trend upwards started in 2012, now at 0.09% in 2014: http://chronicle.nytlabs.com/?keyword=while.whilst&format=percent http://chronicle.nytlabs.com/?keyword=while.whilst&format=pe...