1976

7.5

1993

6.5

1989

5.3

2016

6.8

2000

6.0

1966

6.2

1953

8.2

2001

6.1

1998

6.4

1990

5.8

1978

3.4

1987

6.0

1998

6.1

2005

6.7

1982

6.7

1965

7.6

2009

5.9

1983

7.9

2019

6.6

2009

5.4