1990

5.9

1993

5.6

1994

5.1

2004

4.6

2019

6.6

1998

5.3

1984

6.1

1985

5.3

1992

6.4

1997

6.2

1999

5.8

1981

6.6

1991

5.3

2018

4.5

2008

4.3

1999

6.1

1998

6.0

2023

6.6

1978

6.4

1995

5.4