1964

5.4

1986

6.7

1984

4.7

1971

5.4

1974

0.0

1987

6.0

2000

6.1

1990

7.4

2001

7.6

1999

7.9

1977

7.3

1969

6.5

1951

6.5

2005

7.3

1985

0.0