From a mixture of precipitation station data and satellite
derived precipitation maps the well-known trend of decreased
rainfall from the mid 1960's to the early 1980's,
followed by a rainfall increase was confirmed.
Since 1982 the 300 mm isohyet has on average
been moving 9.4 km north per year.
The map shows the rainfall trend 1982-2004, and the positions of the
300 mm isohyet in 1984 (drought year) and 1994 (wet year).
