1975

7.4

1964

7.9

1990

6.7

1985

3.5

2005

5.9

1984

7.1

1998

5.5

1978

4.7

1985

3.6

2010

7.4

1965

7.8

1959

7.5

1969

6.1

1986

7.1

1968

5.7

1973

7.0

1988

6.0

2003

7.6

2011

7.4

1994

5.0

1976

7.5

1965

5.4

1971

5.4

1968

6.8

1982

2.5

1980

8.0

1990

6.8

2016

0.0