1958

7.6

2005

6.8

2006

6.0

2003

7.2

2003

6.6

1968

7.3

1962

7.2

1970

7.1

1979

7.0

1980

6.6

1982

6.4

1988

6.3

2007

6.6

2008

7.0

1964

7.5

2020

6.6

2017

5.3

1942

6.6

1955

7.8

1925

7.1