1985

4.4

1998

3.5

1984

4.6

1999

2.8

1978

4.0

1986

6.5

2017

5.7

1988

4.1

1985

5.7

1984

6.1

1991

4.7

1987

4.4

1992

4.7

1993

3.4

1994

2.5

1990

5.2