1977

5.4

1986

4.6

1982

5.2

1982

4.9

2009

6.8

1998

5.7

1984

6.1

2000

6.5

1994

5.8

1971

4.6

1975

4.3

1988

5.6

2023

5.2

2008

4.0

1997

4.2

2017

4.1

2000

6.0

2004

7.2

1993

6.1

1981

6.5