In 1998 , it was estimated that approximately eight millionths of one percent ( 1 in 12 million ) of elevator rides result in an anomaly , and the vast majority of these were minor things such as the doors failing to open .
In 1998 , it was estimated that approximately eight 100-millionths of one percent ( 1 in 12 million ) of elevator rides resulted in an anomaly , and the vast majority of these were minor things such as the doors failing to open .