Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
| Year | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 |
|---|---|---|---|---|---|---|---|
| 2012 | 1.000 | ||||||
| 2013 | 0.999 | 1.000 | |||||
| 2014 | 0.995 | 0.998 | 1.000 | ||||
| 2015 | 0.997 | 1.000 | 0.998 | 1.000 | |||
| 2016 | 0.996 | 0.999 | 0.999 | 1.000 | 1.000 | ||
| 2017 | 0.995 | 0.999 | 0.999 | 1.000 | 1.000 | 1.000 | |
| 2018* | 0.941 | 0.951 | 0.968 | 0.954 | 0.959 | 0.959 | 1.000 |
*Note: there is no data in June, August, October, and December, 2018
