1996

7.5

1976

7.0

1971

7.9

2001

2.0

1983

7.8

1975

6.3

1987

6.8

1978

5.8

1992

3.0

1971

6.5

1998

8.2

1981

2.5

1994

7.2

1971

6.3

1990

4.1

2003

4.9

1984

7.1

2004

7.9

1997

6.4

1993

7.1

1993

7.6

1994

7.8

1981

5.5

1992

3.7

1993

7.7

1955

6.6

1992

7.3

1981

7.6

1975

4.3

1984

7.2

1977

3.5

1992

4.0

1978

5.0

1993

7.0

1969

6.0

2000

8.5

1967

6.7

2001

7.4

1975

6.7

1981

6.0

1974

7.0

1976

6.0

2007

7.1

1993

5.8

2011

8.2

1986

6.7

1993

3.6

1997

2.5

1986

4.8

2011

6.7

2006

5.6

1973

5.8

1975

5.5

1975

6.4

1990

7.4

1992

6.8

1971

5.0

1985

7.5

1968

5.6

1979

5.7

1977

5.8

1972

6.9

1977

7.7

1979

5.0

1987

4.7

1994

6.7

1974

5.0

1978

7.5