I looked at NSW & went back (maybe too long ago) from 1984/5 to 2014/5.
In 1984/5 we had 414 sires standing in NSW.........woweeeeee....... Now ?????
In 1984/5 we had 6359 mares served , in 2014/5 we had 1614 (including imp. semen).
In 1984/5 we had 2577 drivers, in 2014/5 we had 867.
In 1984/5 we had 2564 horses named, in 2014/5 896.
In 1984/5 we had 2814 trainers, in 2014/5 we had 1040.
As at 31/8/2015
http://www.harness.org.au/hra/annual/public/stats.htm