1.   High unemployment rates are a perennial problem in several European countries.

2.   Lack of resources has been a perennial problem since the beginning.

3.   ...the perennial urban problems of drugs and homelessness.

4.   Flooding is a perennial problem for people living by the river.

5.   Alison MacDonald on the perennial problem of child care.

6.   Another of the perennial problems Mr Hinde mentions is inferior equipment.

7.   It is a perennial problem.

8.   A perennial major problem in Boston.

9.   But historically, funding has been a perennial problem for archaeologists.

10.   China and Japan trade are perennial problems for Clinton.