1961

7.9

1976

8.1

1983

8.2

1991

5.5

1999

7.2

1972

8.7

1959

8.1

1974

8.6

1990

7.4

2004

6.6

2013

7.3

1989

5.7

1993

5.0

2005

0.0

1954

7.9

1990

8.5

1993

7.5

2016

6.6

1995

6.5

2003

7.2