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