Populations appear to have increased from 1966 to 1979 and remained stable from 1980 to 1995 (Verbeek and Butler 1999). ###>Les populations semblent avoir augmentÃ© de 1966 Ã 1979 et Ãªtre restÃ©es stables de 1980 Ã 1995 (Verbeek et Butler, 1999).