2001

6.8

1990

6.1

1983

5.5

1999

6.0

1986

6.8

1994

6.2

1976

7.3

2006

6.1

1989

6.3

2017

0.0

1994

6.0

1992

7.5

1925

5.0

1967

4.8

1985

6.6

2003

5.5

2007

6.3

1988

4.9

2017

7.5

1993

5.9