1934

4.1

1979

6.9

1959

7.9

1997

7.4

1995

7.7

1979

7.7

2000

7.1

1961

7.3

1963

7.0

1964

7.0

1990

8.5

1939

7.9

1994

8.5

1980

6.1

1973

0.0

2016

5.6

2017

6.1

1999

8.4

1972

7.1

2001

7.4