1977

7.7

1999

7.3

2000

7.1

1975

7.8

2000

7.6

2008

6.6

2014

2.8

1997

5.6

1966

6.5

2004

6.7

2006

5.8

1971

7.7

1993

6.5

2004

5.8

1992

6.7

1983

7.3

1963

5.9

2019

8.0

1997

7.3

2000

5.3