Pari gbolohun yii: Jansen gba akọkọ ninu awọn akọle orilẹ-ede Dutch mẹta ti o tẹle ni akoko 1977 <unk> 78. O kopa ninu awọn idije idije ISU marun-un, o pari 17th ni awọn Europeans 1978 ni Strasbourg, Faranse; 18th ni awọn Worlds 1978 ni Ottawa, Ontario, Canada; 20th ni awọn Europeans 1979 ni Zagreb, Yugoslavia; 23rd ni awọn European Championships 1978 ni Zagreb, Yugoslavia;
1979 Worlds ní Vienna, Austria; àti 18th ní 1980 Europeans ní Gothenburg, Sweden.