1) Data for long-term trend not available.
a) Trend – change (in %) in an index value between the first and last year of a time period (Long-term trend – over the period 1980-2003, Short-term trend – over the period 1990-2003).
b) Slope – multiplicative trend over a time period considered, reflects average percentage change per year. If the slope value is 1, there is no trend. If > 1, there is a positive trend, if < 1, trend is negative. For instance, 1.08 means 8 % increase per year, 0.93 means 7 % decline per year. Slope standard error in parenthesis (Short-term slope – over the period 1990-2003).
c) Migratory status
sd – short-distance migrant or resident
ld – long-distance migrant.