1964

7.3

2003

5.3

2003

7.4

2017

7.1

1999

6.2

1988

6.8

1993

6.7

1978

6.0

1991

5.2

1989

6.3

2002

5.9

2014

7.5

1976

5.6

2003

6.6

1995

6.6

2007

6.0

2006

5.6

1994

6.2

1984

5.7

1935

0.0