1963

7.1

1964

7.3

2007

6.2

1969

6.6

2003

8.3

1979

7.7

1977

7.8

1994

6.8

1973

7.4

1990

8.5

1992

6.7

2013

0.0

1995

8.4

2007

6.3

1997

6.6

1999

6.3

2002

6.0

1999

7.6

2005

6.9

1932

7.5