Frame:time
[genls <a href="ibo.html">ibo</a>] [when <a href="past.html">past</a>] [type <a href="start-of-hour.html">start-of-hour</a>] [change <a href="increasing.html">increasing</a>] [when <a href="increasing.html">increasing</a>] [before <a href="1980s.html">1980s</a>] [begin <a href="2000-25.html">2000-25</a>] [end <a href="2000.html">2000</a>] [importance <a href="important.html">important</a>] [after <a href="wwII.html">wwII</a>]