1975

7.3

1964

7.9

1990

6.7

1985

5.0

1984

7.1

1998

5.4

1978

5.0

1985

3.8

2010

7.4

1965

7.8

1959

7.4

1969

6.0

1986

7.1

1968

5.7

1973

7.0

1988

6.4

2003

7.6

2011

7.4

1994

5.0

1976

7.5

1965

5.5

1971

5.5

1968

6.8

1982

2.5

1980

8.0

1990

6.9

2016

0.0