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.
The time axis (x-axis) is time in the sense of transactions, starting from 1.0 at the beginning of the continuous trade stage for the first trading day (01/01/2006) until the end of the continuous trade stage of the last trading day (31/12/2009).
