1990

7.9

2007

7.2

1972

5.3

1984

6.2

1994

8.5

1977

8.2

2011

6.7

1968

6.9

1962

7.7

1980

8.4

2008

8.5

1970

7.0

1957

8.1

2015

7.4

1972

7.9

1961

7.9

1964

8.1

1999

8.0

1975

8.0

1994

7.1