Graph illustrating safety system failures per year from 1989 to 2001. Graph starts at approximately 3.5 in 1989 then fluctuates trending downward ranging from just over 4.0 down to 3.0 between 1989 and 1992, from 3.0 down to just under 2.0 between 1993 and 1996, from 2.0 to 3.0 between 1997 and 1999, and sloping downward from 2.0 to just above 0.5 from 1999 to 2001.
Note: Safety system failures are any events or conditions that could prevent the fulfillment of a safety function by a safety system. The total number of safety system failures across the industry has declined since 1992.