1951

6.8

1980

6.5

2017

7.6

2005

4.5

1955

6.6

1985

6.1

1972

5.8

2000

5.9

1964

6.6

1946

6.3

2008

4.9

1992

6.6

1978

6.0

2004

6.4

1973

6.6

1979

7.1

1990

5.6

1942

6.9

2022

5.0

2016

0.5