1987

1^st - Germany

2^nd - USA

3^rd - Singapore

1991

1^st - Germany

2^nd - Canada

3^rd - Switzerland

1995

1^st - Switzerland

2^nd - USA

3^rd - Sweden

1999

1^st - Switzerland

2^nd - Canada

3^rd - USA

2003

1st - USA

2^nd - Germany

3^rd – Scotland