1966

7.5

1988

7.8

2000

7.7

2001

5.3

2003

7.7

1980

5.8

1975

7.1

2000

8.0

1973

6.6

2005

6.0

1974

6.8

1996

7.8

2006

8.1

1972

6.5

1996

7.3

0.0

2006

5.0

2012

0.0

2019

0.0

2011

7.5