1966

5.0

1997

6.7

1963

8.4

1988

6.1

2004

6.9

1996

6.0

2000

6.8

1986

6.2

1975

6.2

1996

5.9

2008

7.0

1999

5.8

1953

7.7

1981

6.1

1998

6.3

2014

0.0

2008

6.6

1992

7.0

1989

6.6

1990

6.0