1980

6.6

1982

6.4

1959

8.1

1990

7.4

1992

6.7

2006

7.7

2000

5.5

1967

6.4

2002

6.9

1987

6.8

2020

8.0

1992

4.7

2015

7.0

1986

7.0

2014

6.3

1920

6.9

1935

6.3

1934

7.0

1998

4.6

1979

6.3