1st Symposium (1992) 2nd Symposium (1993) 3rd Symposium (1994) 4th Symposium (1995) 5th Symposium (1996) 6th Symposium (1997) 7th Symposium (1998) 8th Symposium (1999) 9th Symposium (2000) 10th Symposium (2001)