1959

7.9

2003

8.2

2007

6.6

1997

6.2

1986

7.6

1980

6.4

1975

6.8

2005

7.5

2002

7.5

2019

7.5

1995

6.2

2002

6.6

1973

8.0

2018

6.6

2018

7.3

1979

6.6

1956

7.1

1999

6.1

1999

6.5

2000

6.4