translate English to French: Even though the long-term trend has been increasing, Figure 3 clearly shows declining trends since the late 1990s in all strata.
MÃªme si la tendance Ã long terme a Ã©tÃ© Ã la hausse, la figure 3 montre clairement des tendances Ã la baisse depuis la fin des annÃ©es 1990 dans toutes les strates.