1985

4.4

1998

3.4

1984

3.8

1999

2.7

1978

4.0

1986

6.2

2017

6.0

1988

4.1

1985

5.7

1984

6.0

1991

4.5

1987

4.3

1992

4.6

1993

3.4

1994

2.6

1990

5.1