In 2004, there was an estimate of 400 to 550. Hope this helps!
- In 1964 there was an estimate of 1000 to 1200
- In 1969 it was the same guess
- In 1980 there was an estimate of 6500
- In 1994 there was an estimate of between 2478 and 12120
- In 1996 there was an estimate of 6000