1966

7.6

2009

4.4

1988

6.2

1969

1.5

1991

5.0

2004

5.7

1970

5.5

1977

4.9

2010

6.6

2001

5.7

1985

5.6

1981

4.9

1971

6.2

1950

8.1

2003

7.8

2001

6.2

1972

7.1

2001

7.4

1997

7.0

1962

8.0