1998

6.6

2005

7.0

2000

7.2

2002

7.1

1979

7.8

2001

7.8

1997

7.0

2004

7.3

1997

7.2

2002

6.4

1968

6.0

2021

0.0

2014

0.0

2021

8.0

1958

0.0

1924

0.0

1984

7.5

1978

7.4