1978

5.2

2004

6.3

2010

7.7

2007

6.3

2001

5.3

1983

6.9

1999

6.4

1986

7.4

1989

6.9

1996

3.3

1960

7.8

1982

6.2

1997

6.6

1980

6.3

1998

6.2

2006

6.5

1972

7.3

2024

0.0

2014

8.5

2024

0.0