1964

5.3

1986

6.8

1984

3.8

1971

5.8

1974

0.0

1987

6.2

2000

5.9

1990

7.4

2001

7.6

1999

7.9

1977

7.3

1969

6.5

1951

7.0

2005

7.0

1985

0.0