they had improved
-avaient amélioré
Past perfect they conjugation of improve.

improve

A total of 62.5 per cent reported that they had improved national forest databases.
Parmi eux, 62,5 % ont indiqué avoir récemment achevé des inventaires forestiers ou être en train d'en effectuer.
A further 69% said they had improved their energy levels, while nearly 59% said GCC had decreased their levels of stress either at work or at home.
En outre, 69 % d'entre eux ont affirmé qu'ils avaient amélioré leurs niveaux d'énergie, tandis que près de 59 % déclaraient que l'initiative GCC avait permis de réduire leur niveau de stress que ce soit au travail ou à la maison.
More than half of the States (52 per cent) stressed that they had improved ATS-related regional cooperation activities, while 40 per cent had actively assisted other countries in dealing with the ATS problem.
Plus de la moitié des États (52 %) ont indiqué qu'ils avaient développé leurs activités de coopération régionale relatives aux stimulants de type amphétamine tandis que 40 % avaient activement aidé d'autres pays à lutter contre ce problème.
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